1
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Thorpe MP, Blackwell DJ, Knollmann BC, Johnston JN. Backbone-Determined Antiarrhythmic Structure-Activity Relationships for a Mirror Image, Oligomeric Depsipeptide Natural Product. J Med Chem 2024; 67:12205-12220. [PMID: 38958200 DOI: 10.1021/acs.jmedchem.4c00923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
Cyclic oligomeric depsipeptides (COD) are a structural class within naturally occurring compounds with a wide range of biological activity. Verticilide is a COD (24-membered ring) that was identified by its inhibition of insect ryanodine receptor (RyR). We have since found that the enantiomer of verticilide (ent-verticilide, 1) is a potent inhibitor of mammalian RyR2, a cardiac calcium channel, and therefore a potential antiarrhythmic agent. Oddly, nat-verticilide does not inhibit RyR2. To further develop ent-verticilide as an antiarrhythmic, we explored potential SAR through systematic modification of the ester's functionality to both N-H and N-Me amides. The syntheses of these ent-verticilide-inspired analogs are detailed using a monomer-based platform enabled by enantioselective catalysis. Two analogs among 23 exhibited measurable reduction of calcium sparks in a functional assay of RyR2 activity. These findings illustrate the value of natural product-inspired therapeutic development, but the less-studied approach where the non-natural enantiomeric series harbors important SAR.
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Affiliation(s)
- Madelaine P Thorpe
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Daniel J Blackwell
- Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee 37235, United States
| | - Bjorn C Knollmann
- Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee 37235, United States
| | - Jeffrey N Johnston
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States
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2
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Mo MY, Wang XJ, Shen RZ, Hu CY, Li XC, Li GW, Liu LT. Enantiospecific Analysis of Carboxylic Acids Using Cinchona Alkaloid Dimers as Chiral Solvating Agents. Anal Chem 2024; 96:7487-7496. [PMID: 38695134 DOI: 10.1021/acs.analchem.4c00053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2024]
Abstract
Cinchona alkaloid derivatives as Brønsted base catalysts have attracted considerable attention in the field of asymmetric catalysis. However, their potential application as chiral solvating agents has not been described. In this research, we investigated the use of the Cinchona alkaloid dimer, namely, (DHQ)2PHAL, as a chiral solvating agent for discerning various mandelic acid derivatives through 1H NMR spectroscopy. The addition of catalytic amounts of DMAP facilitated this process. Our experimental results demonstrate that dimeric (DHQ)2PHAL exhibits remarkable chiral discrimination properties regarding the diagnostic split protons of 1H NMR signals (including 24 examples, up to 0.321 ppm). Furthermore, it serves as an excellent chiral discriminating agent and provides good resolution for racemic chiral phosphoric acid as determined by 31P NMR spectroscopy. The quality of enantiodifferentiation has also been evaluated by means of the parameter "resolution (Rs)". Significantly, this class of CSAs based on (alkaloid)2linker systems with an azaaromatic linker can be directly employed, which is commercially available in an enantiopure form at very low cost and exhibits promising potential in determining the enantiopurity of α-hydroxy acids by chemoselective and biocatalytic reactions.
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Affiliation(s)
- Ming-Yang Mo
- School of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
- College of Chemistry and Chemical Engineering, Henan Engineering Research Center for Green Synthesis of Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
| | - Xiao-Juan Wang
- College of Chemistry and Chemical Engineering, Henan Engineering Research Center for Green Synthesis of Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
| | - Ren-Zeng Shen
- College of Chemistry and Chemical Engineering, Henan Engineering Research Center for Green Synthesis of Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
| | - Chang-Yan Hu
- College of Chemistry and Chemical Engineering, Henan Engineering Research Center for Green Synthesis of Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
| | - Xue-Chun Li
- College of Chemistry and Chemical Engineering, Henan Engineering Research Center for Green Synthesis of Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
| | - Gao-Wei Li
- School of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
- College of Chemistry and Chemical Engineering, Henan Engineering Research Center for Green Synthesis of Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
| | - Lan-Tao Liu
- School of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
- College of Chemistry and Chemical Engineering, Henan Engineering Research Center for Green Synthesis of Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
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3
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Siebert A, Kazmaier U. Chemical Ligation-Mediated Total Synthesis of Corramycin. Org Lett 2024; 26:3169-3173. [PMID: 38564715 DOI: 10.1021/acs.orglett.4c00774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
The ligation-mediated total synthesis of corramycin, a myxobacterial natural product of the strain Corallococcus coralloides, is presented. The synthetic strategy included using two consecutive chemical ligations for a modular and efficient preparation. Finally, the synthesis employed a Ser/Thr ligation (STL) at a new ligation site combined with classical fragment coupling. This study provides the total synthesis of corramycin and enhances the preparative toolbox of STL in organic synthesis.
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Affiliation(s)
- Andreas Siebert
- Organic Chemistry I, Saarland University, Campus, Building C4.2, D-66123 Saarbrücken, Germany
| | - Uli Kazmaier
- Organic Chemistry I, Saarland University, Campus, Building C4.2, D-66123 Saarbrücken, Germany
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Saarland University, Campus, C8.1, 66123 Saarbrücken, Germany
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4
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Zhong C, Zou J, Mao W, Yang P, Zhang J, Gou S, Zhang Y, Liu H, Ni J. Structure modification of anoplin for fighting resistant bacteria. Eur J Med Chem 2024; 268:116276. [PMID: 38452726 DOI: 10.1016/j.ejmech.2024.116276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 02/21/2024] [Accepted: 02/21/2024] [Indexed: 03/09/2024]
Abstract
The emergence of bacterial resistance has posed a significant challenge to clinical antimicrobial treatment, rendering commonly used antibiotics ineffective. The development of novel antimicrobial agents and strategies is imperative for the treatment of resistant bacterial infections. Antimicrobial peptides (AMPs) are considered a promising class of antimicrobial agents due to their low propensity for resistance and broad-spectrum activity. Anoplin is a small linear α-helical natural antimicrobial peptide that was isolated from the venom of the solitary wasp Anplius samariensis. It exhibits rich biological activity, particularly broad-spectrum antimicrobial activity and low hemolytic activity. Over the past three decades, more than 40 research publications on anoplin have been made available online. This review focuses on the advancements of anoplin in antimicrobial research, encompassing its sources, characterization, antimicrobial activity, influencing factors and structural modifications. The aim is to provide assistances for the development of new antimicrobial agents that can combat bacterial resistance.
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Affiliation(s)
- Chao Zhong
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, PR China; Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, PR China.
| | - Jing Zou
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, PR China
| | - Wenbo Mao
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, PR China
| | - Ping Yang
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, PR China
| | - Jingying Zhang
- Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, PR China
| | - Sanhu Gou
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, PR China; Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, PR China
| | - Yun Zhang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, PR China; Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, PR China
| | - Hui Liu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, PR China; Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, PR China
| | - Jingman Ni
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, PR China; Institute of Pharmaceutics, School of Pharmacy, Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, and Research Unit of Peptide Science, Chinese Academy of Medical Sciences, 2019RU066, Lanzhou University, Lanzhou 730000, PR China.
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5
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Cai S, Tang H, Li B, Shao Y, Zhang D, Zheng H, Qiao T, Chu X, He G, Xue XS, Chen G. Formaldehyde-Mediated Hydride Liberation of Alkylamines for Intermolecular Reactions in Hexafluoroisopropanol. J Am Chem Soc 2024; 146:5952-5963. [PMID: 38408428 DOI: 10.1021/jacs.3c12215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
The ability of alkylamines to spontaneously liberate hydride ions is typically restrained, except under specific intramolecular reaction settings. Herein, we demonstrate that this reactivity can be unlocked through simple treatment with formaldehyde in hexafluoroisopropanol (HFIP) solvent, thereby enabling various intermolecular hydride transfer reactions of alkylamines under mild conditions. Besides transformations of small molecules, these reactions enable unique late-stage modification of complex peptides. Mechanistic investigations uncover that the key to these intermolecular hydride transfer processes lies in the accommodating conformation of solvent-mediated macrocyclic transition states, where the aggregates of HFIP molecules act as dexterous proton shuttles. Importantly, negative hyperconjugation between the lone electron pair of nitrogen and the antibonding orbital of amine's α C-H bond plays a critical role in the C-H activation, promoting its hydride liberation.
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Affiliation(s)
- Shaokun Cai
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Hong Tang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Bo Li
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Yingbo Shao
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Danqi Zhang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Hanliang Zheng
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Tianjiao Qiao
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xin Chu
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Gang He
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xiao-Song Xue
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Gong Chen
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
- Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
- Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
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6
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Biswas S, Bolm C. Rhodium(II)-Catalyzed N-H Insertions of Carbenes under Mechanochemical Conditions. Org Lett 2024; 26:1511-1516. [PMID: 38358095 DOI: 10.1021/acs.orglett.4c00216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
Under mechanochemical conditions in a mixer mill, Rh2(OAc)4 catalyzes the reaction between aryldiazoesters and anilines to give α-amino esters. The process proceeds under mild conditions and is insensitive to air. It is solvent-free and scalable. A broad substrate scope, short reaction times, operational simplicity, and good functional group tolerance are additional salient features of this protocol.
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Affiliation(s)
- Sourav Biswas
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Carsten Bolm
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
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7
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Kumar R, Mahata B, Gayathridevi S, Vipin Raj K, Vanka K, Sen SS. Lanthanide Mimicking by Magnesium for Oxazolidinone Synthesis. Chemistry 2024; 30:e202303478. [PMID: 37897110 DOI: 10.1002/chem.202303478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 10/26/2023] [Accepted: 10/27/2023] [Indexed: 10/29/2023]
Abstract
In the last decade, magnesium complexes have emerged as a viable alternative to transition-metal catalysts for the hydrofunctionalization of unsaturated bonds. However, their potential for advanced catalytic reactions has not been thoroughly investigated. To address this gap, we have developed a novel magnesium amide compound (3) using a PNP framework that is both bulky and flexible. Our research demonstrates that compound 3 can effectively catalyze the synthesis of biologically significant oxazolidinone derivatives. This synthesis involves a tandem reaction of hydroalkoxylation and cyclohydroamination of isocyanate using propargyl alcohol. Furthermore, we conducted comprehensive theoretical calculations to gain insights into the reaction mechanism. It is important to note that these types of transformations have not been reported for magnesium and would significantly enhance the catalytic portfolio of the 7th most abundant element.
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Affiliation(s)
- Rohit Kumar
- Inorganic Chemistry and Catalysis Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Biplab Mahata
- Inorganic Chemistry and Catalysis Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - S Gayathridevi
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India
| | - K Vipin Raj
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India
| | - Kumar Vanka
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India
| | - Sakya S Sen
- Inorganic Chemistry and Catalysis Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
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8
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Yeom S, Kim DY, Kim S, Gontala A, Park J, Lee YH, Kim HJ. Carboxylate-Directed Pd-Catalyzed β-C(sp 3)-H Arylation of N-Methyl Alanine Derivatives for Diversification of Bioactive Peptides. Org Lett 2023; 25:9008-9013. [PMID: 38084750 DOI: 10.1021/acs.orglett.3c03616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
This study presents a Pd(II)-catalyzed method for the β-C(sp3)-H arylation of N-Cbz- or N-Fmoc-protected N-methyl alanines, providing ready access to building blocks for N-methylated peptide synthesis. For this transformation, the native carboxylate was exploited as the directing group, attributing its success to the use of a monoprotected amino-pyridine ligand. Its synthetic utility was demonstrated by facile generation of nine analogues of the naturally occurring N-methylated cyclic peptide cycloaspeptide A.
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Affiliation(s)
- Suyeon Yeom
- Department of Chemistry and Center for Proteogenome Research, Korea University, Seoul 02841, Republic of Korea
| | - Do Young Kim
- Department of Chemistry and Center for Proteogenome Research, Korea University, Seoul 02841, Republic of Korea
| | - Seungwoo Kim
- Department of Chemistry and Center for Proteogenome Research, Korea University, Seoul 02841, Republic of Korea
| | - Arjun Gontala
- Department of Chemistry and Center for Proteogenome Research, Korea University, Seoul 02841, Republic of Korea
| | - Jimin Park
- Department of Chemistry and Center for Proteogenome Research, Korea University, Seoul 02841, Republic of Korea
| | - Yong Ho Lee
- Department of Chemistry and Center for Proteogenome Research, Korea University, Seoul 02841, Republic of Korea
| | - Hak Joong Kim
- Department of Chemistry and Center for Proteogenome Research, Korea University, Seoul 02841, Republic of Korea
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9
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Li X, Wang N, Liu Y, Li W, Bai X, Liu P, He CY. Backbone N-methylation of peptides: Advances in synthesis and applications in pharmaceutical drug development. Bioorg Chem 2023; 141:106892. [PMID: 37776681 DOI: 10.1016/j.bioorg.2023.106892] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Revised: 09/16/2023] [Accepted: 09/25/2023] [Indexed: 10/02/2023]
Abstract
Peptide-based drugs have garnered considerable attention in recent years owing to their increasingly crucial role in the treatment of diverse diseases. However, the limited pharmacokinetic properties of peptides have hindered their full potential. One prominent strategy for enhancing the druggability of peptides is N-methylation, which involves the addition of a methyl group to the nitrogen atom of the peptide backbone. This modification significantly improves the stability, bioavailability, receptor binding affinity and selectivity of peptide drug candidates. In this review, we provide a comprehensive overview of the advancements in synthetic methods for N-methylated peptide synthesis, as well as the associated limitations. Moreover, we explore the versatile effects of N-methylation on various aspects of peptide properties. Furthermore, we emphasize the efforts dedicated to N-methylated peptide pharmaceuticals that have successfully obtained marketing approval.
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Affiliation(s)
- Xuefei Li
- Key Laboratory of Basic Pharmacology of Ministry of Education, Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Zunyi Medical University, Zunyi, Guizhou 563000, China; Central Research Institute, United-Imaging Healthcare Group Co., Ltd, Shanghai, China
| | - Ningchao Wang
- Central Research Institute, United-Imaging Healthcare Group Co., Ltd, Shanghai, China
| | - Yuhang Liu
- Central Research Institute, United-Imaging Healthcare Group Co., Ltd, Shanghai, China
| | - Weipiao Li
- Key Laboratory of Basic Pharmacology of Ministry of Education, Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Zunyi Medical University, Zunyi, Guizhou 563000, China
| | - Xinyu Bai
- Key Laboratory of Basic Pharmacology of Ministry of Education, Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Zunyi Medical University, Zunyi, Guizhou 563000, China
| | - Ping Liu
- Key Laboratory of Basic Pharmacology of Ministry of Education, Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Zunyi Medical University, Zunyi, Guizhou 563000, China
| | - Chun-Yang He
- Key Laboratory of Basic Pharmacology of Ministry of Education, Key Laboratory of Biocatalysis & Chiral Drug Synthesis of Guizhou Province, Zunyi Medical University, Zunyi, Guizhou 563000, China.
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10
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Wu X, Sun Y, Zeng Y, Li X. Mechanistic Insights into Oxazolone Synthesis by Bimetallic Au-Pd-Catalyzed Catalysis and Catalyst Design: DFT Investigations. J Org Chem 2023. [PMID: 37449782 DOI: 10.1021/acs.joc.3c00751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
Bimetallic synergistic catalysis is one of the most effective and powerful strategies for the synthesis of oxazolones, an important species in organic synthesis. In this work, the mechanism of AuCl(PMe3)/AgOTf-Pd(0) ([Au-Pd]) bimetallic catalyst-catalyzed oxazolone synthesis using N-alkynyl carbamates as precursors was studied in detail by DFT calculations and the catalytic performances of a series of bimetallic catalysts were evaluated. The results show that the reaction begins from the [Au]-catalyzed cycloisomerization of N-alkynyl carbamates. After the five-membered intermediate is formed, the [Pd(0)]-catalyzed cycle starts, which contains three steps: oxidation addition, transmetalation, and reductive elimination. The whole reaction belongs to a catalyzed catalysis, and the reductive elimination is the rate-determining step. In the transmetalation process, both the [Pd(0)] catalyst and the ionic bridge are necessary. For the [Au-Pd]-catalyzed process, it is Cl- as the bridge, not OTf-. The cheaper metal compound, AgCl(PMe3), can serve as the alternative of AuCl(PMe3) to co-catalyze with the [Pd(0)] catalyst for the title reaction.
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Affiliation(s)
- Xueju Wu
- College of Chemistry and Material Science, Hubei Key Laboratory of Inorganic and Nano-Materials, National Demonstration Center for Experimental Chemistry, Hebei Normal University, Shijiazhuang 050024, P. R. China
| | - Yuanyuan Sun
- College of Chemistry and Material Science, Hubei Key Laboratory of Inorganic and Nano-Materials, National Demonstration Center for Experimental Chemistry, Hebei Normal University, Shijiazhuang 050024, P. R. China
| | - Yanli Zeng
- College of Chemistry and Material Science, Hubei Key Laboratory of Inorganic and Nano-Materials, National Demonstration Center for Experimental Chemistry, Hebei Normal University, Shijiazhuang 050024, P. R. China
| | - Xiaoyan Li
- College of Chemistry and Material Science, Hubei Key Laboratory of Inorganic and Nano-Materials, National Demonstration Center for Experimental Chemistry, Hebei Normal University, Shijiazhuang 050024, P. R. China
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11
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Todaro B, Ottalagana E, Luin S, Santi M. Targeting Peptides: The New Generation of Targeted Drug Delivery Systems. Pharmaceutics 2023; 15:1648. [PMID: 37376097 DOI: 10.3390/pharmaceutics15061648] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Revised: 05/22/2023] [Accepted: 05/29/2023] [Indexed: 06/29/2023] Open
Abstract
Peptides can act as targeting molecules, analogously to oligonucleotide aptamers and antibodies. They are particularly efficient in terms of production and stability in physiological environments; in recent years, they have been increasingly studied as targeting agents for several diseases, from tumors to central nervous system disorders, also thanks to the ability of some of them to cross the blood-brain barrier. In this review, we will describe the techniques employed for their experimental and in silico design, as well as their possible applications. We will also discuss advancements in their formulation and chemical modifications that make them even more stable and effective. Finally, we will discuss how their use could effectively help to overcome various physiological problems and improve existing treatments.
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Affiliation(s)
- Biagio Todaro
- NEST Laboratory, Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy
| | - Elisa Ottalagana
- NEST Laboratory, Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy
- Fondazione Pisana per la Scienza, Via Ferruccio Giovannini 13, San Giuliano Terme, 56017 Pisa, Italy
| | - Stefano Luin
- NEST Laboratory, Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy
- NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy
| | - Melissa Santi
- NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, 56127 Pisa, Italy
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12
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Li X, Benet-Buchholz J, Escudero-Adán EC, Kleij AW. Silver-Mediated Cascade Synthesis of Functionalized 1,4-Dihydro-2H-benzo-1,3-oxazin-2-ones from Carbon Dioxide. Angew Chem Int Ed Engl 2023; 62:e202217803. [PMID: 36637337 DOI: 10.1002/anie.202217803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/12/2023] [Accepted: 01/13/2023] [Indexed: 01/14/2023]
Abstract
A conceptually novel catalytic domino approach is presented for the synthesis of highly functional 1,4-dihydro-2H-1,3-benzoxazine-2-one derivatives. Key to the chemoselectivity is a proper design of the precursor to override thermodynamically favored parasitic cyclization processes and empower the formation of the desired product through Thorpe-Ingold effects. The synthetic diversity of these CO2 -based heterocycles is further demonstrated, and the isolation of a reaction intermediate supports an unusual ring-expansion sequence from an α-alkylidene, five-membered cyclic carbonate to a six-membered cyclic carbamate by N-induced isomerization.
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Affiliation(s)
- Xuetong Li
- Institute of Chemical Research of Catalonia (ICIQ), the Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007, Tarragona, Spain.,Universitat Rovira i Virgili, C/Marcel⋅lí Domingo s/n, 43007, Tarragona, Spain
| | - Jordi Benet-Buchholz
- Institute of Chemical Research of Catalonia (ICIQ), the Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007, Tarragona, Spain
| | - Eduardo C Escudero-Adán
- Institute of Chemical Research of Catalonia (ICIQ), the Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007, Tarragona, Spain
| | - Arjan W Kleij
- Institute of Chemical Research of Catalonia (ICIQ), the Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007, Tarragona, Spain.,Catalan Institute of Research and Advanced Studies (ICREA), Pg. Lluís Companys 23, 08010, Barcelona, Spain
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13
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Wang J, Wang W, Yang X, Liu J, Huang H, Chang M. Practical N-alkylation via homogeneous iridium-catalyzed direct reductive amination. Sci China Chem 2023. [DOI: 10.1007/s11426-022-1494-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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14
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Smith A, Thorpe MP, Blackwell DJ, Batiste SM, Hopkins CR, Schley ND, Knollmann BC, Johnston JN. Structure-Activity Relationships for the N-Me- Versus N-H-Amide Modification to Macrocyclic ent-Verticilide Antiarrhythmics. ACS Med Chem Lett 2022; 13:1755-1762. [PMID: 36385927 PMCID: PMC9661706 DOI: 10.1021/acsmedchemlett.2c00377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Accepted: 09/29/2022] [Indexed: 11/28/2022] Open
Abstract
The synthesis of all N-Me and N-H analogues of ent-verticilide is described, enabling a structure-activity relationship study based on cardiac ryanodine receptor (RyR2) calcium ion channel inhibition. The use of permeabilized cardiomyocytes allowed us to correlate the degree of N-methylation with activity without concern for changes in passive membrane permeability that these modifications can cause. A key hypothesis was that the minimal pharmacophore may be repeated in this cyclic oligomeric octadepsipeptide (a 24-membered macrocycle), opening the possibility that target engagement will not necessarily be lost with a single N-Me → N-H modification. The effect in the corresponding 18-membered ring oligomer (ent-verticilide B1) was also investigated. We report here that a high degree of N-methyl amide content is critical for activity in the ent-verticilide series but not entirely so for the ent-verticilide B1 series.
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Affiliation(s)
- Abigail
N. Smith
- Department
of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville 37235, Tennessee, United States
| | - Madelaine P. Thorpe
- Department
of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville 37235, Tennessee, United States
| | - Daniel J. Blackwell
- Department
of Medicine, Vanderbilt University Medical
Center, Nashville 37235, Tennessee, United States
| | - Suzanne M. Batiste
- Department
of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville 37235, Tennessee, United States
| | - Corey R. Hopkins
- Department
of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center, Omaha 68198, Nebraska, United States
| | - Nathan D. Schley
- Department
of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville 37235, Tennessee, United States
| | - Bjorn C. Knollmann
- Department
of Medicine, Vanderbilt University Medical
Center, Nashville 37235, Tennessee, United States
| | - Jeffrey N. Johnston
- Department
of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville 37235, Tennessee, United States
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15
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Yu X, Tang Z, He K, Li W, Lin J, Jin Y. Catalyst-free highly regioselective hydrated ring-opening and formylation of quinazolinones. Org Biomol Chem 2022; 20:6654-6658. [PMID: 35938290 DOI: 10.1039/d2ob01234k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A catalyst-free method for the highly regioselective hydrated ring-opening and formylation of quinazolinones was developed. This reaction realized the direct arylation of two nitrogen atoms on quinazolinones and realized the regioselective ring-opening of quinazolinone and subsequent acylation of methyleneamine through the nucleophilic addition of a water molecule to an imine carbon atom. It showed reasonable functional group compatibility and provided one-pot access to a variety of N-arylformyl derivatives in moderate to excellent yields.
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Affiliation(s)
- Xianglin Yu
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China.
| | - Zhiliang Tang
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China.
| | - Kun He
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China.
| | - Weina Li
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China.
| | - Jun Lin
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China.
| | - Yi Jin
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China.
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16
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An Exploration of the Effect of the Kleier Model and Carrier-Mediated Theory to Design Phloem-Mobile Pesticides Based on Researching the N-Alkylated Derivatives of Phenazine-1-Carboxylic Acid-Glycine. Molecules 2022; 27:molecules27154999. [PMID: 35956949 PMCID: PMC9370529 DOI: 10.3390/molecules27154999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Revised: 07/29/2022] [Accepted: 08/01/2022] [Indexed: 11/29/2022] Open
Abstract
The Kleier model and Carrier-mediated theory are effective for molecularly designing pesticides with phloem mobility. However, the single Kleier model or Carrier-mediated theory cannot achieve a reliable explanation of the phloem mobility of all exogenous substances. A detailed investigation of the two models and the scope of their applications can provide a more accurate and highly efficient basis for the guidance of the design and development of phloem-mobile pesticides. In the present paper, a strategy using active ingredient-amino acid conjugates as mode compounds is developed based on Carrier-mediated theory. An N-alkylated amino acid is used to improve the pesticide’s physicochemical properties following the Kleier model, thus allowing the conjugates to fall on the predicted and more accessible transportation region of phloem. Moreover, the influence of this movement on phloem is inspected by the Kleier model and Carrier-mediated theory. To verify this strategy, a series of N-alkylated phenazine-1-carboxylic acid-glycine compounds (PCA-Gly) were designed and synthesized. The results related to the castor bean seeds (R. communis L.) indicated that all the target compounds (4a−4f) had phloem mobility. The capacity for phloem mobility shows that N-alkylated glycine containing small substituents can significantly improve PCA phloem mobility, such as 4c(i-C3H7-N) > 4a(CH3-N) ≈ 4b(C2H5-N) > 4d (t-C4H9-N) > PCA-Gly > 4e(C6H5-N) > 4f(CH2COOH-N), with an oil−water partition coefficient between 1.2~2.5. In particular, compounds 4a(CH3-N), 4b(C2H5-N), and 4c(i-C3H7-N) present better phloem mobility, with the average concentrations in phloem sap of 14.62 μΜ, 13.98 μΜ, and 17.63 μΜ in the first 5 h, which are 8 to 10 times higher than PCA-Gly (1.71 μΜ). The results reveal that the Kleier model and Carrier-mediated theory play a guiding role in the design of phloem-mobile pesticides. However, the single Kleier model or Carrier-mediated theory are not entirely accurate. Still, there is a synergism between Carrier-mediated theory and the Kleier model for promoting the phloem transport of exogenous compounds. Therefore, we suggest the introduction of endogenous plant compounds as a promoiety to improve the phloem mobility of pesticides through Carrier-mediated theory. It is necessary to consider the improvement of physicochemical properties according to the Kleier model, which can contribute to a scientific theory for developing phloem-mobile pesticides.
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17
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Substrate-controlled selective acylation of quinazolinones: Access to 2-benzamido-N-formylbenzamides and 3-benzoylquinazolinones. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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18
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Dhara HN, Rakshit A, Alam T, Patel BK. Metal-catalyzed reactions of organic nitriles and boronic acids to access diverse functionality. Org Biomol Chem 2022; 20:4243-4277. [PMID: 35552581 DOI: 10.1039/d2ob00288d] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The nitrile or cyano (-CN) group is one of the most appreciated and effective functional groups in organic synthesis, having a polar unsaturated C-N triple bond. Despite sufficient stability and being intrinsically inert, the nitrile group can be easily transformed into many other functional groups, such as amines, carboxylic acids, ketones, etc. which makes it a vital group in organic synthesis. On the other hand, despite several boronic acids having a low level of genotoxicity, they have found wide applicability in the field of organic synthesis, especially in transition metal-catalyzed cross-coupling reactions. Recently, transition-metal-catalyzed cascade additions or addition/cyclization processes of boronic acids to the nitrile group open up exciting and useful strategies to prepare a variety of functional molecules through the formation of C-C, C-N and CO bonds. Boronic acids can be added to the cyano functionality through catalytic carbometallation or through a radical cascade process to provide newer pathways for the rapid construction of various important acyclic ketones or amides, carbamidines, carbocycles and N,O-heterocycles. The present review focuses on various transition-metal-catalyzed additions of boronic acids via carbometallation or radical cascade processes using the cyano group as an acceptor.
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Affiliation(s)
- Hirendra Nath Dhara
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India.
| | - Amitava Rakshit
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India.
| | - Tipu Alam
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India.
| | - Bhisma K Patel
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India.
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19
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Bartoccini F, Regni A, Retini M, Piersanti G. Asymmetric Total Synthesis of All Rugulovasine Stereoisomers and Preliminary Evaluation of their Biological Properties. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Francesca Bartoccini
- Universita degli Studi di Urbino Carlo Bo Department of Biomolecular Sciences Urbino ITALY
| | - Alessio Regni
- Universita degli Studi di Urbino Carlo Bo Department of Biomolecular Sciences ITALY
| | - Michele Retini
- Universita degli Studi di Urbino Carlo Bo Department of Biomolecular Sciences ITALY
| | - Giovanni Piersanti
- Universita degli Studi di Urbino Carlo Bo Department of Biomolecular Sciences P.zza Rinascimento 6 61029 Urbino ITALY
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20
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Liu T, Ni S, Guo W. Practical asymmetric amine nucleophilic approach for the modular construction of protected α-quaternary amino acids. Chem Sci 2022; 13:6806-6812. [PMID: 35774153 PMCID: PMC9200120 DOI: 10.1039/d2sc02318k] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 05/15/2022] [Indexed: 12/12/2022] Open
Abstract
We report the first amine nucleophilic approach for the modular construction of enantioenriched protected α-quaternary amino acids. The key to success is the use of an alcohol solvent, which makes a rationally designed COOMe-bonded Cu-allenylidene electrophilic intermediate stable enough to couple with amine nucleophiles before its decomposition. The reaction features wide functional group tolerance with high enantioselectivity, typically >90% ee, and is amenable to the modification of commercially available bioactive molecules. The resultant protected α-amino acids could be readily converted into a number of precious enantioenriched amines featuring α-hindered tertiary carbon centers, which are otherwise synthetically quite challenging, including those of α-amino aldehyde, peptides or α-vinyl amino ester with >92% ee in excellent yields. This protocol could be utilized for the synthesis of the protected bioactive α-ethylnorvaline in 3 steps, a significant advancement in comparison to an 11-step sequence reported previously. We report the first amine nucleophilic approach for the modular construction of enantioenriched protected α-quaternary amino acids.![]()
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Affiliation(s)
- Teng Liu
- Frontier Institute of Science and Technology (FIST), Xi'an Jiaotong University, Yanxiang Road 99, Xi'an 710045, China
| | - Shaofei Ni
- Department of Chemistry, Shantou University, Shantou 515063, China
| | - Wusheng Guo
- Frontier Institute of Science and Technology (FIST), Xi'an Jiaotong University, Yanxiang Road 99, Xi'an 710045, China
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21
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Souto JA, Román D, Domínguez M, Lera ÁR. Synthetic Studies on Alotamide A: Construction of
N
‐Demethylalotamide A. European J Org Chem 2021. [DOI: 10.1002/ejoc.202101104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- José A. Souto
- CINBIO Universidade de Vigo Departamento de Química Orgánica 36310 Vigo España
| | - David Román
- CINBIO Universidade de Vigo Departamento de Química Orgánica 36310 Vigo España
| | - Marta Domínguez
- CINBIO Universidade de Vigo Departamento de Química Orgánica 36310 Vigo España
| | - Ángel R. Lera
- CINBIO Universidade de Vigo Departamento de Química Orgánica 36310 Vigo España
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22
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Ma Y, Yao A, Chen X, Wang L, Ma C, Xi X, Chen T, Shaw C, Zhou M. Generation of truncated derivatives through in silico enzymatic digest of peptide GV30 target MRSA both in vitro and in vivo. Comput Struct Biotechnol J 2021; 19:4984-4996. [PMID: 34584638 PMCID: PMC8441110 DOI: 10.1016/j.csbj.2021.08.039] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 08/26/2021] [Accepted: 08/26/2021] [Indexed: 01/06/2023] Open
Abstract
A novel host-defence peptide GV30 was identified from the frog skin secretion of Hylarana guentheri. Seven short AMPs were generated by in silico enzymatic digest of GV30 using an online proteomic bioinformatic tool PeptideCutter in ExPASy server. Two truncated products, GV23 and GV21, exhibited an improved antibacterial effect against MRSA in vitro and demonstrated a faster bactericidal effect than the parent peptide. GV 21 was found to have a better in vivo anti-MRSA activity and retain the good antibacterial activity under salt and serum conditions, along with lower toxicity.
Methicillin-resistant Staphylococcus aureus (MRSA) causing serious hospital-acquired infections and skin infections has become a “superbug” in clinical treatment. Although the clinical treatment of MRSA is continuously improving, due to its unceasing global spread, MRSA has produced much heated discussion and focused study, therefore suggesting an urgent task to find new antibacterial drugs to combat this issue. Antimicrobial peptides (AMPs) are used as the last-resort drugs for treating multidrug-resistant bacterial infections, but their utilisation is still limited due to their low stability and often strong toxicity. Here, we evaluated the structure and the bioactivity of an AMP, GV30, derived from the frog skin secretions of Hylarana guentheri, and designed seven truncated derivatives based on the presence of cleavage sites for trypsin using an online proteomic bioinformatic resource PeptideCutter tool. We investigated the anti-MRSA effect, toxicity and salt- and serum-resistance of these peptides. Interestingly, the structure–activity relationship revealed that removing “Rana box” loop could significantly improve the bactericidal speed on MRSA. Among these derivatives, GV21 (GVIFNALKGVAKTVAAQLLKK-NH2), because of its faster antibacterial effect, lower toxicity, and retains the good antibacterial activity and stability of the parent peptide, is considered to become a new potential antibacterial candidate against MRSA.
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Affiliation(s)
- Yingxue Ma
- Natural Drug Discovery Group, School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, Northern Ireland, UK
| | - Aifang Yao
- Natural Drug Discovery Group, School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, Northern Ireland, UK
| | - Xiaoling Chen
- Natural Drug Discovery Group, School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, Northern Ireland, UK
| | - Lei Wang
- Natural Drug Discovery Group, School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, Northern Ireland, UK
| | - Chengbang Ma
- Natural Drug Discovery Group, School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, Northern Ireland, UK
| | - Xinping Xi
- Natural Drug Discovery Group, School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, Northern Ireland, UK
| | - Tianbao Chen
- Natural Drug Discovery Group, School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, Northern Ireland, UK
| | - Chris Shaw
- Natural Drug Discovery Group, School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, Northern Ireland, UK
| | - Mei Zhou
- Natural Drug Discovery Group, School of Pharmacy, Queen's University Belfast, Belfast BT9 7BL, Northern Ireland, UK
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23
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Rostami A, Ebrahimi A, Sakhaee N, Golmohammadi F, Al-Harrasi A. Microwave-Assisted Electrostatically Enhanced Phenol-Catalyzed Synthesis of Oxazolidinones. J Org Chem 2021; 87:40-55. [PMID: 34581567 DOI: 10.1021/acs.joc.1c01686] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
An electrostatically enhanced phenol is utilized as a straightforward, sustainable, and potent one-component organocatalyst for the atom-economic transformation of epoxides to oxazolidinones under microwave irradiation. Integrating a positively charged center into phenols over a modular one-step preparation gives rise to a bifunctional system with improved acidity and activity, competent in rapid assembly of epoxides and isocyanates under microwave irradiation in a short reaction time (20-60 min). A careful assessment of the efficacy of various positively charged phenols and anilines and the impact of several factors, such as catalyst loading, temperature, and the kind of nucleophile, on catalytic reactivity were examined. Under neat conditions, this one-component catalytic platform was exploited to prepare more than 40 examples of oxazolidinones from a variety of aryl- and alkyl-substituted epoxides and isocyanates within minutes, where up to 96% yield and high degree of selectivity were attained. DFT calculations to achieve reaction barriers for different catalytic routes were conducted to provide mechanistic understanding and corroborated the experimental findings in which concurrent epoxide ring-opening and isocyanate incorporation were proposed.
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Affiliation(s)
- Ali Rostami
- Natural and Medical Sciences Research Center (NMSRC), University of Nizwa, Nizwa 616, Sultanate of Oman
| | - Amirhossein Ebrahimi
- Natural and Medical Sciences Research Center (NMSRC), University of Nizwa, Nizwa 616, Sultanate of Oman
| | - Nader Sakhaee
- Roger Adams Laboratory, University of Illinois, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
| | - Farhad Golmohammadi
- Natural and Medical Sciences Research Center (NMSRC), University of Nizwa, Nizwa 616, Sultanate of Oman
| | - Ahmed Al-Harrasi
- Natural and Medical Sciences Research Center (NMSRC), University of Nizwa, Nizwa 616, Sultanate of Oman
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24
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Jiang Y, Hu TD, Yu LY, Ding YH. A more effective catalysis of the CO 2 fixation with aziridines: computational screening of metal-substituted HKUST-1. NANOSCALE ADVANCES 2021; 3:4079-4088. [PMID: 36132833 PMCID: PMC9419783 DOI: 10.1039/d1na00150g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Accepted: 06/03/2021] [Indexed: 05/12/2023]
Abstract
A vital issue for the fixation and conversion of CO2 into useful chemical products is to find effective catalysts. In this work, in order to develop more effective and diverse catalysts, we implemented the first computational screening study (at M06-2X//B3LYP level) on the cycloaddition of CO2 with aziridines under eighteen metal-substituted HKUST-1 MOFs and tetrabutylammonium bromide (TBAB) as a co-catalyst. For all considered catalytic systems, the ring-opening of aziridine is calculated to be the rate-determining step. Up to 11 M-HKUST-1 systems, i.e., Rh (31.87 kcal mol-1), Y (31.02), Sc (30.50), V (30.02), Tc (29.90), Cd (29.80), Ti (29.32), Mn (29.05), Zn (28.29), Fe (27.85) and Zr (25.09), possess lower ring-opening barrier heights than the original Cu-HKUST-1 (32.90), indicative of their superior catalytic ability to the original Cu-HKUST-1 in theory. With the lowest ring-opening barrier, Zr-HKUST-1 is strongly advocated for future synthetic and catalytic studies.
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Affiliation(s)
- Yan Jiang
- Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University Changchun 130023 P. R. China
| | - Tian-Ding Hu
- Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University Changchun 130023 P. R. China
| | - Li-Ying Yu
- Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University Changchun 130023 P. R. China
| | - Yi-Hong Ding
- Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University Changchun 130023 P. R. China
- Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University Wenzhou 325035 P. R. China
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25
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Toda Y, Shishido M, Aoki T, Sukegawa K, Suga H. Switchable synthesis of cyclic carbamates by carbon dioxide fixation at atmospheric pressure. Chem Commun (Camb) 2021; 57:6672-6675. [PMID: 34132256 DOI: 10.1039/d1cc02493k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The base-promoted switchable synthesis of five- and six-membered cyclic carbamates using atmospheric pressure carbon dioxide as the C1 source was developed. The chemoselectivity of products was simply controlled by changing bases and solvents. The reaction proceeds effectively under mild conditions, affording valuable cyclic carbamates. Experimental results and DFT studies revealed the reaction mechanism.
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Affiliation(s)
- Yasunori Toda
- Department of Materials Chemistry, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
| | - Minoru Shishido
- Department of Materials Chemistry, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
| | - Tatsuya Aoki
- Department of Materials Chemistry, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
| | - Kimiya Sukegawa
- Department of Materials Chemistry, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
| | - Hiroyuki Suga
- Department of Materials Chemistry, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
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26
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Vušak D, Smrečki N, Muratović S, Žilić D, Prugovečki B, Matković-Čalogović D. Structural diversity in the coordination compounds of cobalt, nickel and copper with N-alkylglycinates: crystallographic and ESR study in the solid state. RSC Adv 2021; 11:23779-23790. [PMID: 35479809 PMCID: PMC9036651 DOI: 10.1039/d1ra04219j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 07/01/2021] [Indexed: 12/26/2022] Open
Abstract
Reactions of N-methylglycine (HMeGly), N-ethylglycine-hydrochloride (H2EtGlyCl) and N-propylglycine-hydrochloride (H2PrGlyCl) with cobalt(ii), nickel(ii) and copper(ii) ions in aqueous solutions resulted in ten new coordination compounds [Co(MeGly)2(H2O)2] (1), [{Co(MeGly)2}2(μ-OH)2]·2H2O (1d), [Cu(MeGly)2(H2O)2] (2α), [Co(EtGly)2(H2O)2] (3), [Ni(EtGly)2(H2O)2] (4), [Cu(μ-EtGly)2] n (5p), [Co(PrGly)2(H2O)2] (6), [Ni(PrGly)2(H2O)2] (7), and two polymorphs of [Cu(PrGly)2(H2O)2] (8α and 8β). Compounds were characterized by single-crystal and powder X-ray diffraction, infrared spectroscopy, thermal analysis and X-band electron spin resonance (ESR) spectroscopy. These studies revealed a wide range of structural types including monomeric, dimeric and polymeric architectures, as well as different polymorphs. In all monomeric compounds, except 2α, and in the coordination polymer 5p hydrogen bonds interconnect the molecules into 2D layers with the alkyl chain pointing outward of the layer. In 2α and in the dimeric compound 1d hydrogen bonds link the molecules into 3D structures. 1d with cobalt(iii), and 4 and 7 with nickel(ii) are ESR silent. The ESR spectra of 1, 3 and 6 are characteristic for paramagnetic high-spin cobalt(ii). The ESR spectra of all copper(ii) coordination compounds show that the unpaired copper electron is located in the d x 2-y 2 orbital, being in agreement with the elongated octahedral geometry.
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Affiliation(s)
- Darko Vušak
- Department of Chemistry, Faculty of Science, University of Zagreb Horvatovac 102a HR-10000 Zagreb Croatia
| | - Neven Smrečki
- Department of Chemistry, Faculty of Science, University of Zagreb Horvatovac 102a HR-10000 Zagreb Croatia
| | - Senada Muratović
- Laboratory for Magnetic Resonances, Division of Physical Chemistry, Ruđer Bošković Institute Bijenička 54 HR-10000 Zagreb Croatia
| | - Dijana Žilić
- Laboratory for Magnetic Resonances, Division of Physical Chemistry, Ruđer Bošković Institute Bijenička 54 HR-10000 Zagreb Croatia
| | - Biserka Prugovečki
- Department of Chemistry, Faculty of Science, University of Zagreb Horvatovac 102a HR-10000 Zagreb Croatia
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27
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Dai Y, Chen J, Wang Z, Wang T, Wang L, Yang Y, Qiao X, Fan B. Asymmetric Reduction of Aromatic α-Dehydroamino Acid Esters with Water as Hydrogen Source. J Org Chem 2021; 86:7141-7147. [PMID: 33966384 DOI: 10.1021/acs.joc.1c00426] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The asymmetric reduction of aromatic α-dehydroamino acid esters with water as the hydrogen source was developed by a Rh/Cu co-catalytic system. The reaction tolerates various functional groups, providing a valuable synthetic tool to access chiral α-amino acid esters readily. Moreover, the present methodology also was applied in the cost-effective and easy to handle preparation of chiral deuterated α-amino esters by using D2O.
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Affiliation(s)
- Yuze Dai
- Key Laboratory of Chemistry in Ethnic Medicinal Resources (Yunnan Minzu University), State Ethnic Affairs Commission and Ministry of Education, Yunnan Minzu University, Kunming 650504, Yunnan, China
| | - Jingchao Chen
- Key Laboratory of Chemistry in Ethnic Medicinal Resources (Yunnan Minzu University), State Ethnic Affairs Commission and Ministry of Education, Yunnan Minzu University, Kunming 650504, Yunnan, China
| | - Zheting Wang
- Key Laboratory of Chemistry in Ethnic Medicinal Resources (Yunnan Minzu University), State Ethnic Affairs Commission and Ministry of Education, Yunnan Minzu University, Kunming 650504, Yunnan, China
| | - Ting Wang
- Key Laboratory of Chemistry in Ethnic Medicinal Resources (Yunnan Minzu University), State Ethnic Affairs Commission and Ministry of Education, Yunnan Minzu University, Kunming 650504, Yunnan, China
| | - Lin Wang
- Key Laboratory of Chemistry in Ethnic Medicinal Resources (Yunnan Minzu University), State Ethnic Affairs Commission and Ministry of Education, Yunnan Minzu University, Kunming 650504, Yunnan, China
| | - Yong Yang
- Chongqing Key Laboratory of Traditional Chinese Medicine Health, Chongqing Accademy of Chinese Materia Medica, Chongqing 400065, China
| | - Xingfang Qiao
- Chongqing Key Laboratory of Traditional Chinese Medicine Health, Chongqing Accademy of Chinese Materia Medica, Chongqing 400065, China
| | - Baomin Fan
- Key Laboratory of Chemistry in Ethnic Medicinal Resources (Yunnan Minzu University), State Ethnic Affairs Commission and Ministry of Education, Yunnan Minzu University, Kunming 650504, Yunnan, China.,Chongqing Key Laboratory of Traditional Chinese Medicine Health, Chongqing Accademy of Chinese Materia Medica, Chongqing 400065, China
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28
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Kerbs A, Mindt M, Schwardmann L, Wendisch VF. Sustainable Production of N-methylphenylalanine by Reductive Methylamination of Phenylpyruvate Using Engineered Corynebacterium glutamicum. Microorganisms 2021; 9:microorganisms9040824. [PMID: 33924554 PMCID: PMC8070496 DOI: 10.3390/microorganisms9040824] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/07/2021] [Accepted: 04/08/2021] [Indexed: 12/17/2022] Open
Abstract
N-alkylated amino acids occur widely in nature and can also be found in bioactive secondary metabolites such as the glycopeptide antibiotic vancomycin and the immunosuppressant cyclosporine A. To meet the demand for N-alkylated amino acids, they are currently produced chemically; however, these approaches often lack enantiopurity, show low product yields and require toxic reagents. Fermentative routes to N-alkylated amino acids like N-methyl-l-alanine or N-methylantranilate, a precursor of acridone alkaloids, have been established using engineered Corynebacterium glutamicum, which has been used for the industrial production of amino acids for decades. Here, we describe metabolic engineering of C. glutamicum for de novo production of N-methylphenylalanine based on reductive methylamination of phenylpyruvate. Pseudomonas putida Δ-1-piperideine-2-carboxylate reductase DpkA containing the amino acid exchanges P262A and M141L showed comparable catalytic efficiencies with phenylpyruvate and pyruvate, whereas the wild-type enzyme preferred the latter substrate over the former. Deletion of the anthranilate synthase genes trpEG and of the genes encoding branched-chain amino acid aminotransferase IlvE and phenylalanine aminotransferase AroT in a strain engineered to overproduce anthranilate abolished biosynthesis of l-tryptophan and l-phenylalanine to accumulate phenylpyruvate. Upon heterologous expression of DpkAP262A,M141L, N-methylphenylalanine production resulted upon addition of monomethylamine to the medium. In glucose-based minimal medium, an N-methylphenylalanine titer of 0.73 ± 0.05 g L−1, a volumetric productivity of 0.01 g L−1 h−1 and a yield of 0.052 g g−1 glucose were reached. When xylose isomerase gene xylA from Xanthomonas campestris and the endogenous xylulokinase gene xylB were expressed in addition, xylose as sole carbon source supported production of N-methylphenylalanine to a titer of 0.6 ± 0.04 g L−1 with a volumetric productivity of 0.008 g L−1 h−1 and a yield of 0.05 g g−1 xylose. Thus, a fermentative route to sustainable production of N-methylphenylalanine by recombinant C. glutamicum has been established.
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Affiliation(s)
- Anastasia Kerbs
- Genetics of Prokaryotes, Faculty of Biology and CeBiTec, Bielefeld University, 33615 Bielefeld, Germany; (A.K.); (L.S.)
| | - Melanie Mindt
- BU Bioscience, Wagenigen University and Research, 6700AA Wageningen, The Netherlands;
| | - Lynn Schwardmann
- Genetics of Prokaryotes, Faculty of Biology and CeBiTec, Bielefeld University, 33615 Bielefeld, Germany; (A.K.); (L.S.)
| | - Volker F. Wendisch
- Genetics of Prokaryotes, Faculty of Biology and CeBiTec, Bielefeld University, 33615 Bielefeld, Germany; (A.K.); (L.S.)
- Correspondence: ; Tel.: +49-521-106-5611
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29
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Yao P, Marshall JR, Xu Z, Lim J, Charnock SJ, Zhu D, Turner NJ. Asymmetric Synthesis of N-Substituted α-Amino Esters from α-Ketoesters via Imine Reductase-Catalyzed Reductive Amination. Angew Chem Int Ed Engl 2021; 60:8717-8721. [PMID: 33555620 PMCID: PMC8048798 DOI: 10.1002/anie.202016589] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 02/01/2021] [Indexed: 11/12/2022]
Abstract
N-Substituted α-amino esters are widely used as chiral intermediates in a range of pharmaceuticals. Here we report the enantioselective biocatalyic synthesis of N-substituted α-amino esters through the direct reductive coupling of α-ketoesters and amines employing sequence diverse metagenomic imine reductases (IREDs). Both enantiomers of N-substituted α-amino esters were obtained with high conversion and excellent enantioselectivity under mild reaction conditions. In addition >20 different preparative scale transformations were performed highlighting the scalability of this system.
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Affiliation(s)
- Peiyuan Yao
- Department of ChemistryUniversity of ManchesterManchester Institute of Biotechnology131 Princess StreetManchesterM1 7DNUK
- National Technology Innovation Center of Synthetic BiologyNational Engineering Laboratory for Industrial Enzymes and Tianjin Engineering Research Center of Biocatalytic TechnologyTianjin Institute of Industrial BiotechnologyChinese Academy of Sciences32 Xi Qi Dao, Tianjin Airport Economic AreaTianjin300308P.R. China
| | - James R. Marshall
- Department of ChemistryUniversity of ManchesterManchester Institute of Biotechnology131 Princess StreetManchesterM1 7DNUK
| | - Zefei Xu
- National Technology Innovation Center of Synthetic BiologyNational Engineering Laboratory for Industrial Enzymes and Tianjin Engineering Research Center of Biocatalytic TechnologyTianjin Institute of Industrial BiotechnologyChinese Academy of Sciences32 Xi Qi Dao, Tianjin Airport Economic AreaTianjin300308P.R. China
| | - Jesmine Lim
- Prozomix LtdBuilding 4, West End Ind. EstateHaltwhistleNE49 9HAUK
| | | | - Dunming Zhu
- National Technology Innovation Center of Synthetic BiologyNational Engineering Laboratory for Industrial Enzymes and Tianjin Engineering Research Center of Biocatalytic TechnologyTianjin Institute of Industrial BiotechnologyChinese Academy of Sciences32 Xi Qi Dao, Tianjin Airport Economic AreaTianjin300308P.R. China
| | - Nicholas J. Turner
- Department of ChemistryUniversity of ManchesterManchester Institute of Biotechnology131 Princess StreetManchesterM1 7DNUK
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30
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Ghaffari S, Kazemi F. Highly Efficient Synthesis of
N
‐Alkyl‐α‐amino Acid Methyl Esters by Microwave Irradiation. ChemistrySelect 2021. [DOI: 10.1002/slct.202100114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Saeedeh Ghaffari
- Department of Chemistry Institute of Advanced Studies in Basic Sciences (IASBS) Zanjan 45195-1159 Iran
- Department of Chemistry, College of Sciences Shiraz University Shiraz 71946-84795 Iran
| | - Foad Kazemi
- Department of Chemistry Institute of Advanced Studies in Basic Sciences (IASBS) Zanjan 45195-1159 Iran
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31
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Yao P, Marshall JR, Xu Z, Lim J, Charnock SJ, Zhu D, Turner NJ. Asymmetric Synthesis of
N
‐Substituted α‐Amino Esters from α‐Ketoesters via Imine Reductase‐Catalyzed Reductive Amination. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202016589] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Peiyuan Yao
- Department of Chemistry University of Manchester Manchester Institute of Biotechnology 131 Princess Street Manchester M1 7DN UK
- National Technology Innovation Center of Synthetic Biology National Engineering Laboratory for Industrial Enzymes and Tianjin Engineering Research Center of Biocatalytic Technology Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 Xi Qi Dao, Tianjin Airport Economic Area Tianjin 300308 P.R. China
| | - James R. Marshall
- Department of Chemistry University of Manchester Manchester Institute of Biotechnology 131 Princess Street Manchester M1 7DN UK
| | - Zefei Xu
- National Technology Innovation Center of Synthetic Biology National Engineering Laboratory for Industrial Enzymes and Tianjin Engineering Research Center of Biocatalytic Technology Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 Xi Qi Dao, Tianjin Airport Economic Area Tianjin 300308 P.R. China
| | - Jesmine Lim
- Prozomix Ltd Building 4, West End Ind. Estate Haltwhistle NE49 9HA UK
| | - Simon J. Charnock
- Prozomix Ltd Building 4, West End Ind. Estate Haltwhistle NE49 9HA UK
| | - Dunming Zhu
- National Technology Innovation Center of Synthetic Biology National Engineering Laboratory for Industrial Enzymes and Tianjin Engineering Research Center of Biocatalytic Technology Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 Xi Qi Dao, Tianjin Airport Economic Area Tianjin 300308 P.R. China
| | - Nicholas J. Turner
- Department of Chemistry University of Manchester Manchester Institute of Biotechnology 131 Princess Street Manchester M1 7DN UK
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32
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Marshall JR, Yao P, Montgomery SL, Finnigan JD, Thorpe TW, Palmer RB, Mangas-Sanchez J, Duncan RAM, Heath RS, Graham KM, Cook DJ, Charnock SJ, Turner NJ. Screening and characterization of a diverse panel of metagenomic imine reductases for biocatalytic reductive amination. Nat Chem 2021; 13:140-148. [PMID: 33380742 PMCID: PMC7116802 DOI: 10.1038/s41557-020-00606-w] [Citation(s) in RCA: 68] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Accepted: 11/10/2020] [Indexed: 01/30/2023]
Abstract
Finding faster and simpler ways to screen protein sequence space to enable the identification of new biocatalysts for asymmetric synthesis remains both a challenge and a rate-limiting step in enzyme discovery. Biocatalytic strategies for the synthesis of chiral amines are increasingly attractive and include enzymatic asymmetric reductive amination, which offers an efficient route to many of these high-value compounds. Here we report the discovery of over 300 new imine reductases and the production of a large (384 enzymes) and sequence-diverse panel of imine reductases available for screening. We also report the development of a facile high-throughput screen to interrogate their activity. Through this approach we identified imine reductase biocatalysts capable of accepting structurally demanding ketones and amines, which include the preparative synthesis of N-substituted β-amino ester derivatives via a dynamic kinetic resolution process, with excellent yields and stereochemical purities.
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Affiliation(s)
- James R. Marshall
- Department of Chemistry, University of Manchester, Manchester Institute of Biotechnology, Manchester, UK
| | - Peiyuan Yao
- Department of Chemistry, University of Manchester, Manchester Institute of Biotechnology, Manchester, UK
- National Engineering Laboratory for Industrial Enzymes, Tianjin Engineering Research Centre of Biocatalytic Technology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin Airport Economic Park, Tianjin, People’s Republic of China
| | - Sarah L. Montgomery
- Department of Chemistry, University of Manchester, Manchester Institute of Biotechnology, Manchester, UK
| | | | - Thomas W. Thorpe
- Department of Chemistry, University of Manchester, Manchester Institute of Biotechnology, Manchester, UK
| | - Ryan B. Palmer
- Department of Chemistry, University of Manchester, Manchester Institute of Biotechnology, Manchester, UK
| | - Juan Mangas-Sanchez
- Department of Chemistry, University of Manchester, Manchester Institute of Biotechnology, Manchester, UK
| | | | - Rachel S. Heath
- Department of Chemistry, University of Manchester, Manchester Institute of Biotechnology, Manchester, UK
| | | | - Darren J. Cook
- Prozomix, Building 4, West End Ind. Estate, Haltwhistle, UK
| | | | - Nicholas J. Turner
- Department of Chemistry, University of Manchester, Manchester Institute of Biotechnology, Manchester, UK
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33
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Gu ZY, Xia JB. [3 + 1 + 1] cyclization of vinyl oxiranes with azides and CO by tandem palladium catalysis: efficient synthesis of oxazolidinones. Org Chem Front 2021. [DOI: 10.1039/d1qo00591j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
An efficient [3 + 1 + 1] cyclization of vinyl oxiranes for the synthesis of oxazolidinones has been developed via tandem palladium catalysis.
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Affiliation(s)
- Zheng-Yang Gu
- College of Textiles and Clothing & Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province
- Yancheng Institute of Technology
- Jiangsu
- China
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
| | - Ji-Bao Xia
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
- Center for Excellence in Molecular Synthesis
- Suzhou Research Institute of LICP
- Lanzhou Institute of Chemical Physics (LICP)
- University of Chinese Academy of Sciences
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34
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Song L, Tian X, Han C, Amanpur M, Rominger F, Hashmi ASK. Catalyst-free synthesis of oxazol-2(3 H)-ones from sulfilimines and diazo compounds through a tandem rearrangement/aziridination/ring-expansion reaction. Org Chem Front 2021. [DOI: 10.1039/d1qo00473e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Oxazol-2(3H)-ones play a significant role in the fields of organic synthesis and drug development.
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Affiliation(s)
- Lina Song
- Institute of Organic Chemistry
- Heidelberg University
- 69120 Heidelberg
- Germany
| | - Xianhai Tian
- Institute of Organic Chemistry
- Heidelberg University
- 69120 Heidelberg
- Germany
| | - Chunyu Han
- Institute of Organic Chemistry
- Heidelberg University
- 69120 Heidelberg
- Germany
| | - Mehran Amanpur
- Institute of Organic Chemistry
- Heidelberg University
- 69120 Heidelberg
- Germany
| | - Frank Rominger
- Institute of Organic Chemistry
- Heidelberg University
- 69120 Heidelberg
- Germany
| | - A. Stephen K. Hashmi
- Institute of Organic Chemistry
- Heidelberg University
- 69120 Heidelberg
- Germany
- Chemistry Department
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35
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Design catalytic space engineering of Ag-Ag bond-based metal organic framework for carbon dioxide fixation reactions. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125529] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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36
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Pająk M. Methylated derivatives of l-tyrosine in reaction catalyzed by l-amino acid oxidase: isotope and inhibitory effects. J Biochem 2020; 168:509-514. [PMID: 32569353 DOI: 10.1093/jb/mvaa066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 06/10/2020] [Indexed: 11/14/2022] Open
Abstract
l-Amino acid oxidase (LAAO) is widely distributed in nature and shows important biological activity. It induces cell apoptosis and has antibacterial properties. This study was designed to investigate the effect of methyl substituent on its activity as methylated derivatives of l-tyrosine, labelled with short-lived B+ emitters, have been used in oncological diagnostics. To study isotope effects in the oxidative deamination of O-methyl-l-tyrosine, the deuterated isotopomer, i.e. O-methyl-[2-2H]-l-tyrosine, was synthesized by isotope exchange, catalyzed enzymatically by tryptophanase. Isotope effects were determined using the spectrophotometric non-competitive method. The values of isotope effects indicate that the α-C-H bond cleavage occurs in the rate determining step of the investigated reaction and α-hydrogen plays a role in the substrate binding process at the enzyme active site. The inhibitory effect on LAAO activity was studied with α-methyl-l-tyrosine and N-methyl-l-tyrosine. The mode of inhibition was determined based on Lineweavear-Burk plots intersections. α-Methyl-l-tyrosine has been found a mixed type inhibitor of the investigated enzyme, whereas N-methyl-l-tyrosine is a non-competitive inhibitor of LAAO.
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Affiliation(s)
- Małgorzata Pająk
- Faculty of Chemistry, University of Warsaw, Pasteur 1 Str, 02-093 Warsaw, Poland
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37
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PrVO4/SnD NPs as a Nanocatalyst for Carbon Dioxide Fixation to Synthesis Benzimidazoles and 2-Oxazolidinones. Catal Letters 2020. [DOI: 10.1007/s10562-020-03410-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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38
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39
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Hajra S, Biswas A. Efficient chemical fixation and defixation cycle of carbon dioxide under ambient conditions. Sci Rep 2020; 10:15825. [PMID: 32978419 PMCID: PMC7519152 DOI: 10.1038/s41598-020-71761-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 07/17/2020] [Indexed: 12/22/2022] Open
Abstract
Chemical fixation of CO2 as a C1 feedstock for producing value-added products is an important post-combustion technology reducing the CO2 emission. As it is an irreversible process, not considered for the CO2 capture and release. Overall, these chemical transformations also do not help to mitigate global warming, as the energy consumed in different forms is much higher than the amount of CO2 fixed by chemical reactions. Here we describe the development of re-generable chemical fixation of CO2 by spiroaziridine oxindole, where CO2 is captured (chemical fixation) under catalyst-free condition at room temperature both in aqueous and non-aqueous medium even directly from the slow stream of flue gas producing regioselectively spirooxazolidinyl oxindoles, a potential drug. The CO2-adduct is reversed back to the spiroaziridine releasing CO2 under mild conditions. Further both the fixation-defixation of CO2 can be repeated under near ambient conditions for several cycles in a single loop using a recyclable reagent.
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Affiliation(s)
- Saumen Hajra
- Center of Biomedical Research, Sanjay Gandhi Post-Graduate Institute of Medical Sciences Campus, Raebareli Road, Lucknow, 226014, India.
| | - Anurag Biswas
- Center of Biomedical Research, Sanjay Gandhi Post-Graduate Institute of Medical Sciences Campus, Raebareli Road, Lucknow, 226014, India
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40
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Khatun R, Biswas S, Biswas IH, Riyajuddin S, Haque N, Ghosh K, Islam SM. Cu-NPs@COF: A potential heterogeneous catalyst for CO2 fixation to produce 2-oxazolidinones as well as benzimidazoles under moderate reaction conditions. J CO2 UTIL 2020. [DOI: 10.1016/j.jcou.2020.101180] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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41
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Liu T, Zhu N, Zhong C, Zhu Y, Gou S, Chang L, Bao H, Liu H, Zhang Y, Ni J. Effect of N-methylated and fatty acid conjugation on analogs of antimicrobial peptide Anoplin. Eur J Pharm Sci 2020; 152:105453. [PMID: 32649983 DOI: 10.1016/j.ejps.2020.105453] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 06/15/2020] [Accepted: 07/02/2020] [Indexed: 12/20/2022]
Abstract
With the increment of drug-resistant bacteria and the slow development of novel antibiotics, antimicrobial peptides have gained increasing attention as a potential antibiotic alternative. They not only displayed a broad-spectrum antimicrobial activity but also were difficult to induce resistance development because of their unique membrane-lytic activity. Herein, to improve the limitations of Anoplin, the N-methyl amino acids were first used to replace the amino acids of Anoplin at sensitive enzymatic cleave sites (Leu, Ile, Lys and Arg). Afterward, the N-methylated analogs M3.6/M4.7/M5.7 with high stability were screened out and further modified by N-terminal fatty acid conjugation to develop new antimicrobial peptide analogs with both potent antimicrobial activity and high proteolytic stability, and 12 new Anoplin analogs Cn-M3.6/M4.7/M5.7 (n = 8,10,12,14) were designed and synthesized. Our results showed that compared with native Anoplin, the stability of these N-methylated lipopeptides against trypsin and chymotrypsin degradation were increased by 104-106 times. Besides, they still possessed potent antimicrobial activity under physiological salts and serum environment. Among them, the new designed analogs C12-M3.6/M4.7/M5.7 showed the optimal antimicrobial activity, synergy and additive effects were also observed when they were combined with traditional antibiotics polymyxin B, rifampin, and kanamycin. Moreover, they could effectively inhibit the formation of biofilms by P. aeruginosa and S. aureus. The antimicrobial mechanism studied revealed that these N-methylated lipopeptides could display a rapid bactericidal effect by destroying the bacterial cell membrane. Notably, no detectable resistance of these new designed peptides was developed after continuous cultured with E. coli for 20 passages. In summary, we have designed a new class of antimicrobial peptide analogs with potent antimicrobial activity and high proteolytic stability through N-methyl amino acids substitution and N-terminal fatty acid conjugation. This study also provides new ideas and methods for the modification of antimicrobial peptides in the future.
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Affiliation(s)
- Tianqi Liu
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China
| | - Ningyi Zhu
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China
| | - Chao Zhong
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China; Key Laboratory of Preclinical Study for New Drugs of Gansu Province School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Yuewen Zhu
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China
| | - Sanhu Gou
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China
| | - Linlin Chang
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China; Key Laboratory of Preclinical Study for New Drugs of Gansu Province School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Hexin Bao
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China
| | - Hui Liu
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China
| | - Yun Zhang
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China
| | - Jingman Ni
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China; Key Laboratory of Preclinical Study for New Drugs of Gansu Province School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China.
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42
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Copper/DTBP-Promoted Oxyselenation of Propargylic Amines with Diselenides and CO 2: Synthesis of Selenyl 2-Oxazolidinones. J Org Chem 2020; 85:10924-10933. [PMID: 32786223 DOI: 10.1021/acs.joc.0c01519] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A highly efficient electrophilic oxyselenation of propargylic amines with diselenides and CO2 under atmospheric pressure promoted by copper/DTBP is reported. Various biologically important selenyl 2-oxazolidinones were produced in moderate to excellent yields. The developed method features a broad substrate scope, easy scalability, and mild reaction conditions.
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43
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Fermentative N-Methylanthranilate Production by Engineered Corynebacterium glutamicum. Microorganisms 2020; 8:microorganisms8060866. [PMID: 32521697 PMCID: PMC7356990 DOI: 10.3390/microorganisms8060866] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 06/02/2020] [Accepted: 06/05/2020] [Indexed: 12/20/2022] Open
Abstract
The N-functionalized amino acid N-methylanthranilate is an important precursor for bioactive compounds such as anticancer acridone alkaloids, the antinociceptive alkaloid O-isopropyl N-methylanthranilate, the flavor compound O-methyl-N-methylanthranilate, and as a building block for peptide-based drugs. Current chemical and biocatalytic synthetic routes to N-alkylated amino acids are often unprofitable and restricted to low yields or high costs through cofactor regeneration systems. Amino acid fermentation processes using the Gram-positive bacterium Corynebacterium glutamicum are operated industrially at the million tons per annum scale. Fermentative processes using C. glutamicum for N-alkylated amino acids based on an imine reductase have been developed, while N-alkylation of the aromatic amino acid anthranilate with S-adenosyl methionine as methyl-donor has not been described for this bacterium. After metabolic engineering for enhanced supply of anthranilate by channeling carbon flux into the shikimate pathway, preventing by-product formation and enhancing sugar uptake, heterologous expression of the gene anmt encoding anthranilate N-methyltransferase from Ruta graveolens resulted in production of N-methylanthranilate (NMA), which accumulated in the culture medium. Increased SAM regeneration by coexpression of the homologous adenosylhomocysteinase gene sahH improved N-methylanthranilate production. In a test bioreactor culture, the metabolically engineered C. glutamicum C1* strain produced NMA to a final titer of 0.5 g·L−1 with a volumetric productivity of 0.01 g·L−1·h−1 and a yield of 4.8 mg·g−1 glucose.
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44
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Sudha AJ, Aslam NA, Sandhu A, Yasuda M, Baba A, Babu SA. Synthesis of β-cyanoalanine and enantiomerically enriched aspartate derivatives via the Zn- or In-mediated nucleophilic addition to α-imino esters. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131217] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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45
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Fu H, Li P, Wang Z, Li X, Dai Q, Hu C. Synthesis of protected α-amino acids via decarboxylation amination from malonate derivatives. Org Biomol Chem 2020; 18:4439-4446. [PMID: 32469354 DOI: 10.1039/d0ob00677g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A general and efficient strategy for the synthesis of protected α-amino acids is reported. The method uses malonate derivatives as the starting materials and Cs2CO3 as a base at 60 degrees, giving α-amino acid derivatives in moderate yields by releasing CO2. This methodology shows broad substrate scope (primary and secondary acids), excellent functional group tolerance and high efficiency to give the desired products under mild reaction conditions. It also allows the construction of β and γ-amino acids and other unnatural products.
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Affiliation(s)
- Hui Fu
- Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
| | - Peihe Li
- Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
| | - Zheng Wang
- Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
| | - Xiaoying Li
- Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
| | - Qipu Dai
- Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
| | - Changwen Hu
- Key Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
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46
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Mindt M, Walter T, Kugler P, Wendisch VF. Microbial Engineering for Production of N-Functionalized Amino Acids and Amines. Biotechnol J 2020; 15:e1900451. [PMID: 32170807 DOI: 10.1002/biot.201900451] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Revised: 03/04/2020] [Indexed: 01/04/2023]
Abstract
N-functionalized amines play important roles in nature and occur, for example, in the antibiotic vancomycin, the immunosuppressant cyclosporine, the cytostatic actinomycin, the siderophore aerobactin, the cyanogenic glucoside linamarin, and the polyamine spermidine. In the pharmaceutical and fine-chemical industries N-functionalized amines are used as building blocks for the preparation of bioactive molecules. Processes based on fermentation and on enzyme catalysis have been developed to provide sustainable manufacturing routes to N-alkylated, N-hydroxylated, N-acylated, or other N-functionalized amines including polyamines. Metabolic engineering for provision of precursor metabolites is combined with heterologous N-functionalizing enzymes such as imine or ketimine reductases, opine or amino acid dehydrogenases, N-hydroxylases, N-acyltransferase, or polyamine synthetases. Recent progress and applications of fermentative processes using metabolically engineered bacteria and yeasts along with the employed enzymes are reviewed and the perspectives on developing new fermentative processes based on insight from enzyme catalysis are discussed.
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Affiliation(s)
- Melanie Mindt
- Genetics of Prokaryotes, Biology and CeBiTec, Bielefeld University, Bielefeld, 33615, Germany.,BU Bioscience, Wageningen University and Research, Wageningen, 6708 PB, The Netherlands
| | - Tatjana Walter
- Genetics of Prokaryotes, Biology and CeBiTec, Bielefeld University, Bielefeld, 33615, Germany
| | - Pierre Kugler
- Genetics of Prokaryotes, Biology and CeBiTec, Bielefeld University, Bielefeld, 33615, Germany
| | - Volker F Wendisch
- Genetics of Prokaryotes, Biology and CeBiTec, Bielefeld University, Bielefeld, 33615, Germany
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47
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Cao C, Xia S, Song Z, Xu H, Shi Y, He L, Cheng P, Zhao B. Highly Efficient Conversion of Propargylic Amines and CO
2
Catalyzed by Noble‐Metal‐Free [Zn
116
] Nanocages. Angew Chem Int Ed Engl 2020; 59:8586-8593. [DOI: 10.1002/anie.201914596] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 02/24/2020] [Indexed: 11/06/2022]
Affiliation(s)
- Chun‐Shuai Cao
- Key Laboratory of Advanced Energy Material Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China
- College of Environmental Science and Engineering Nankai University Tianjin 300350 China
| | - Shu‐Mei Xia
- State Key Laboratory and Institute of Elemento-Organic Chemistry Nankai University Tianjin 300071 China
| | - Zhen‐Jun Song
- Key Laboratory of Advanced Energy Material Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China
| | - Hang Xu
- Key Laboratory of Advanced Energy Material Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China
| | - Ying Shi
- Key Laboratory of Advanced Energy Material Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China
| | - Liang‐Nian He
- State Key Laboratory and Institute of Elemento-Organic Chemistry Nankai University Tianjin 300071 China
| | - Peng Cheng
- Key Laboratory of Advanced Energy Material Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China
| | - Bin Zhao
- Key Laboratory of Advanced Energy Material Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China
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48
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Cao C, Xia S, Song Z, Xu H, Shi Y, He L, Cheng P, Zhao B. Highly Efficient Conversion of Propargylic Amines and CO
2
Catalyzed by Noble‐Metal‐Free [Zn
116
] Nanocages. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914596] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Chun‐Shuai Cao
- Key Laboratory of Advanced Energy Material Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China
- College of Environmental Science and Engineering Nankai University Tianjin 300350 China
| | - Shu‐Mei Xia
- State Key Laboratory and Institute of Elemento-Organic Chemistry Nankai University Tianjin 300071 China
| | - Zhen‐Jun Song
- Key Laboratory of Advanced Energy Material Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China
| | - Hang Xu
- Key Laboratory of Advanced Energy Material Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China
| | - Ying Shi
- Key Laboratory of Advanced Energy Material Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China
| | - Liang‐Nian He
- State Key Laboratory and Institute of Elemento-Organic Chemistry Nankai University Tianjin 300071 China
| | - Peng Cheng
- Key Laboratory of Advanced Energy Material Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China
| | - Bin Zhao
- Key Laboratory of Advanced Energy Material Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China
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49
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Rostami A, Ebrahimi A, Husband J, Anwar MU, Csuk R, Al-Harrasi A. Squaramide-Quaternary Ammonium Salt as an Effective Binary Organocatalytic System for Oxazolidinone Synthesis from Isocyanates and Epoxides. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000153] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ali Rostami
- Natural and Medical Sciences Research Center (NMSRC); University of Nizwa; 616 Nizwa Sultanate of Oman
| | - Amirhossein Ebrahimi
- Natural and Medical Sciences Research Center (NMSRC); University of Nizwa; 616 Nizwa Sultanate of Oman
| | - John Husband
- Department of Chemistry; College of Science; Sultan Qaboos University; PO Box 36, Al-Khod 123 Muscat Sultanate of Oman
| | - Muhammad Usman Anwar
- Natural and Medical Sciences Research Center (NMSRC); University of Nizwa; 616 Nizwa Sultanate of Oman
| | - Rene Csuk
- Organic Chemistry, Kurt-Mothes-str. 2; College of Science; Martin-Luther-University Halle-Wittenberg; 06120 Halle Saale Germany
| | - Ahmed Al-Harrasi
- Natural and Medical Sciences Research Center (NMSRC); University of Nizwa; 616 Nizwa Sultanate of Oman
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50
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Cycloaddition of Propargylic Amines and CO2 by Ni@Pd Nanoclusters Confined Within Metal–Organic Framework Cavities in Aqueous Solution. Catal Letters 2020. [DOI: 10.1007/s10562-019-03072-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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