1
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Zhou Y, Jones AM. A General Method to Access Underexplored Ylideneamino Sulfates as Interrupted Beckmann-Type Rearrangement Intermediates. Molecules 2024; 29:1667. [PMID: 38611947 PMCID: PMC11013155 DOI: 10.3390/molecules29071667] [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: 03/18/2024] [Revised: 03/26/2024] [Accepted: 04/03/2024] [Indexed: 04/14/2024] Open
Abstract
The Beckmann rearrangement of ketoximes to their corresponding amides, using a Brønsted acid-mediated fragmentation and migration sequence, has found wide-spread industrial application. We postulated that the development of a methodology to access ylideneamino sulfates using tributylsulfoammonium betaine (TBSAB) would afford isolable Beckmann-type intermediates and competent partners for subsequent rearrangement cascades. The ylideneamino sulfates generated, isolated as their tributylammonium salts, are sufficiently activated to undergo Beckmann rearrangement without additional reagent activation. The generation of sulfuric acid in situ from the ylideneamino sulfate giving rise to a routine Beckmann rearrangement and additional amide bond cleavage to the corresponding aniline was detrimental to reaction success. The screening of bases revealed inexpensive sodium bicarbonate to be an effective additive to prevent classic Brønsted acid-mediated fragmentation and achieve optimal conversions of up to 99%.
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Affiliation(s)
| | - Alan M. Jones
- School of Pharmacy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
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2
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Sinha SK, Ghosh P, Jain S, Maiti S, Al-Thabati SA, Alshehri AA, Mokhtar M, Maiti D. Transition-metal catalyzed C-H activation as a means of synthesizing complex natural products. Chem Soc Rev 2023; 52:7461-7503. [PMID: 37811747 DOI: 10.1039/d3cs00282a] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/10/2023]
Abstract
Over the past few decades, the advent of C-H activation has led to a rethink among chemists about the synthetic strategies employed for multi-step transformations. Indeed, deploying innovative and masterful tricks against the numerous classical organic transformations has been the need of the hour. Despite this, the immense importance of C-H activation remains unfulfilled unless the methodology can be deployed for large-scale industrial processes and towards the concise, step-economic synthesis of prodigious natural products and pharmaceutical drugs. Lately, the growing potential of C-H activation methodology has indeed driven the pioneers of synthetic organic chemists into finding more efficient methods to accelerate the synthesis of such complex molecular scaffolds. This review aims to draw a general overview of the various C-H activation procedures that have been adopted for synthesizing these vast majority of structurally complicated natural products. Our objective lies in drawing a complete picture and taking the readers through the synthesis of a series of such complex organic compounds by simplified techniques, making it step-economic on a larger scale and thus instigating the readers to trigger the use of such methodology and uncover new, unique patterns for future synthesis of such natural products.
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Affiliation(s)
- Soumya Kumar Sinha
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
| | - Pintu Ghosh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
| | - Shubhanshu Jain
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
| | - Siddhartha Maiti
- School of Biosciences, Engineering and Technology, VIT Bhopal University, Kothrikalan, Sehore, Madhya Pradesh - 466114, India
| | - Shaeel A Al-Thabati
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia
| | - Abdulmohsen Ali Alshehri
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia
| | - Mohamed Mokhtar
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia
| | - Debabrata Maiti
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
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3
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Jiang H, Li K, Zeng M, Tan C, Chen Z, Yin G. Pd(II)/Lewis Acid Catalyzed Intramolecular Annulation of Indolecarboxamides with Dioxygen through Dual C-H Activation. J Org Chem 2022; 87:13919-13934. [PMID: 36205496 DOI: 10.1021/acs.joc.2c01613] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Transition-metal ion catalyzed intramolecular dual C-H activation to construct polycyclic heteroarene skeletons is merited for its step and atom-economic advantages in organic synthesis. However, in most cases, stoichiometric oxidants, elevated temperature, and other harsh conditions were commonly faced for this reaction, which apparently block the synthetic applications. Herein, we report a Pd(II)/LA (LA: Lewis acid) catalyzed intramolecular dual C-H activation to construct indoloquinolinone derivatives under mild conditions with dioxygen as the sole oxidant. It was found that adding LA such as Sc3+ to Pd(OAc)2 sharply improved its catalytic efficiency, whereas Pd(OAc)2 alone was very sluggish. The activity improvement was attributed to the linkage of the Sc3+ cation to the Pd(II) species through a diacetate bridge that significantly enhanced the electrophilic properties of Pd(II) for dual C-H activation.
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Affiliation(s)
- Hongwu Jiang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Kaiwen Li
- Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Miao Zeng
- Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Chen Tan
- Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Zhuqi Chen
- Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Guochuan Yin
- Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
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4
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Morozov V, Shklyaev Y. Metal‐Free Rapid Diastereoselective Construction of Isocryptolepine Core
via
Elecrophilic Dearomatization ‐ Inramolecular Michael Addition Sequence. ChemistrySelect 2022. [DOI: 10.1002/slct.202201709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Vyacheslav Morozov
- Laboratory of Active Compounds Synthesis Institute of Technical Chemistry UB RAS Akademika Korolyeva St. 3 614013 Perm Russian Federation
| | - Yurii Shklyaev
- Laboratory of Active Compounds Synthesis Institute of Technical Chemistry UB RAS Akademika Korolyeva St. 3 614013 Perm Russian Federation
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5
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Dehydrative Beckmann rearrangement and the following cascade reactions. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.10.020] [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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6
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Gan Z, Zhang K, Shi P, Zhao Y, Zeng R. Copper(i)-catalyzed radical carboamination reaction of 8-aminoquinoline-oriented buteneamides with chloroform: synthesis of-β-lactams. RSC Adv 2021; 11:28081-28084. [PMID: 35480755 PMCID: PMC9037986 DOI: 10.1039/d1ra05233k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 08/11/2021] [Indexed: 11/21/2022] Open
Abstract
A novel Cu(CH3CN)4PF6-catalyzed carboamination reaction of 8-aminoquinoline-oriented buteneamides with chloroform to afford 4-(2,2,2-trichloroethyl)-β-lactams is described. The reaction proceeded at 110 °C in air with di-t-butyl peroxide. Preliminary studies indicated that the reaction undergoes a free radical mechanism via a Cu(i)/Cu(ii)/Cu(iii) catalytic cycle.
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Affiliation(s)
- Zixu Gan
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry Chemical Engineering and Materials Science, Soochow University Suzhou Jiangsu 215123 China
| | - Ke Zhang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry Chemical Engineering and Materials Science, Soochow University Suzhou Jiangsu 215123 China
| | - Peng Shi
- Institute of Organic Chemistry, RWTH Aachen University Landoltweg1 52074 Aachen Germany
| | - Yingsheng Zhao
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry Chemical Engineering and Materials Science, Soochow University Suzhou Jiangsu 215123 China
| | - Runsheng Zeng
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry Chemical Engineering and Materials Science, Soochow University Suzhou Jiangsu 215123 China
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7
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Hsueh WY, Lee YSE, Huang MS, Lai CH, Gao YS, Lin JC, Chen YF, Chang CL, Chou SY, Chen SF, Lu YY, Chang LH, Lin SF, Lin YH, Hsu PC, Wei WY, Huang YC, Kao YF, Teng LW, Liu HH, Chen YC, Yuan TT, Chan YW, Huang PH, Chao YT, Huang SY, Jian BH, Huang HY, Yang SC, Lo TH, Huang GR, Wang SY, Lin HS, Chuang SH, Huang JJ. Copper(I)-Catalyzed Nitrile-Addition/ N-Arylation Ring-Closure Cascade: Synthesis of 5,11-Dihydro-6 H-indolo[3,2- c]quinolin-6-ones as Potent Topoisomerase-I Inhibitors. J Med Chem 2021; 64:1435-1453. [PMID: 33492141 DOI: 10.1021/acs.jmedchem.0c00727] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
In this paper, we present a copper(I)-catalyzed nitrile-addition/N-arylation ring-closure cascade for the synthesis of 5,11-dihydro-6H-indolo[3,2-c]quinolin-6-ones from 2-(2-bromophenyl)-N-(2-cyanophenyl)acetamides. Using CuBr and t-BuONa in dimethylformamide (DMF) as the optimal reaction conditions, the cascade reaction gave the target products, in high yields, with a good substrate scope. Application of the cascade reaction was demonstrated on the concise total syntheses of alkaloid isocryptolepine. Further optimization of the products from the cascade reaction led to 3-chloro-5,12-bis[2-(dimethylamino)ethyl]-5,12-dihydro-6H-[1,3]dioxolo[4',5':5,6]indolo[3,2-c]quinolin-6-one (2k), which exhibited the characteristic DNA topoisomerase-I inhibitory mechanism of action with potent in vitro anticancer activity. Compound 2k actively inhibited ARC-111- and SN-38-resistant HCT-116 cells and showed in vivo activity in mice bearing human HCT-116 and SJCRH30 xenografts. The interaction of 2k with the Top-DNA cleavable complex was revealed by docking simulations to guide the future optimization of 5,11-dihydro-6H-indolo[3,2-c]quinolin-6-ones as topoisomerase-I inhibitors.
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Affiliation(s)
- Wen-Yun Hsueh
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Ying-Shuan E Lee
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Min-Sian Huang
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Chin-Hung Lai
- Department of Applied Chemistry, Chung Shan Medical University, Taichung 40201, Taiwan
| | - Yu-Sheng Gao
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Jo-Chu Lin
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Yu-Fen Chen
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Chih-Lin Chang
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Shan-Yen Chou
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Shyh-Fong Chen
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Yann-Yu Lu
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Lien-Hsiang Chang
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Shu Fu Lin
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Yu-Hsiang Lin
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Pi-Chen Hsu
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Win-Yin Wei
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Ya-Chi Huang
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Yi-Feng Kao
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Li-Wei Teng
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Hung-Huang Liu
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Ying-Chou Chen
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Ta-Tung Yuan
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Ya-Wen Chan
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Po-Hsun Huang
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Yu-Ting Chao
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Shin-Yi Huang
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Bo-Han Jian
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Hsin-Yi Huang
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Sheng-Chuan Yang
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Tzu-Hao Lo
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Guan-Ru Huang
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Shao-Yun Wang
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan
| | - Her-Sheng Lin
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Shih-Hsien Chuang
- Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
| | - Jiann-Jyh Huang
- Department of Applied Chemistry, National Chiayi University, No. 300, Syuefu Road, Chiayi City 60004, Taiwan.,Development Center for Biotechnology, National Biotechnology Research Park, Taipei City 11571, Taiwan
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8
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Talukdar R. Tracking down the brominated single electron oxidants in recent organic red-ox transformations: photolysis and photocatalysis. Org Biomol Chem 2020; 18:8294-8345. [PMID: 33020775 DOI: 10.1039/d0ob01652g] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A wide range of organic and inorganic brominated compounds including molecular bromine have been extensively used as oxidants in many organic photo-redox transformations in recent years, an area of ever growing interest because of greener and milder approaches. The oxidation power of these compounds is utilized through both mechanistic pathways (by hydrogen atom transfer or HAT in the absence of a photocatalyst and a combination of single electron transfer or SET and/or HAT in the presence of a photocatalyst). Not only as terminal oxidants for regeneration of photocatalysts, but brominated reactants have also contributed to the oxidation of the reaction intermediate(s) to carry on the radical chain process in several reactions. Here in this review mainly the non-brominative oxidative product formations are discussed, carried out since the last two decades, skipping the instances where they acted as terminal oxidants only to regenerate photocatalysts. The reactions are used to generate natural products, pharmaceuticals and beyond.
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Affiliation(s)
- Ranadeep Talukdar
- Molecular Synthesis and Drug Discovery Laboratory, Centre of Biomedical Research, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow-226014, India.
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9
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Tang L, Wang ZL, He YH, Guan Z. An Electrochemical Beckmann Rearrangement: Traditional Reaction via Modern Radical Mechanism. CHEMSUSCHEM 2020; 13:4929-4936. [PMID: 32710520 DOI: 10.1002/cssc.202001553] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Indexed: 06/11/2023]
Abstract
Electrosynthesis as a potential means of introducing heteroatoms into the carbon framework is rarely studied. Herein, the electrochemical Beckmann rearrangement, i. e. the direct electrolysis of ketoximes to amides, is presented for the first time. Using a constant current as the driving force, the reaction can be easily carried out under neutral conditions at room temperature. Based on a series of mechanistic studies, a novel radical Beckmann rearrangement mechanism is proposed. This electrochemical Beckmann rearrangement does not follow the trans-migration rule of the classical Beckmann rearrangement.
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Affiliation(s)
- Li Tang
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, P. R. China
| | - Zhi-Lv Wang
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, P. R. China
| | - Yan-Hong He
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, P. R. China
| | - Zhi Guan
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, P. R. China
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10
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Tang L, Wang ZL, Wan HL, He YH, Guan Z. Visible-Light-Induced Beckmann Rearrangement by Organic Photoredox Catalysis. Org Lett 2020; 22:6182-6186. [PMID: 32790434 DOI: 10.1021/acs.orglett.0c02168] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A facile and general strategy for efficient direct conversion of oximes to amides using an inexpensive organic photocatalyst and visible light is described. This radical Beckmann rearrangement can be performed under mild conditions. Various alkyl aryl ketoximes and diaryl ketoximes can be effectively converted into the corresponding amides in excellent yields.
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Affiliation(s)
- Li Tang
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Zhi-Lv Wang
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Hai-Lan Wan
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Yan-Hong He
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Zhi Guan
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
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11
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Thobokholt EN, Larghi EL, Bracca ABJ, Kaufman TS. Isolation and synthesis of cryptosanguinolentine (isocryptolepine), a naturally-occurring bioactive indoloquinoline alkaloid. RSC Adv 2020; 10:18978-19002. [PMID: 35518305 PMCID: PMC9054090 DOI: 10.1039/d0ra03096a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 05/04/2020] [Indexed: 11/28/2022] Open
Abstract
Cryptosanguinolentine (isocryptolepine) is one of the minor naturally-occurring monomeric indoloquinoline alkaloids, isolated from the West African climbing shrub Cryptolepis sanguinolenta. The natural product displays such a simple and unique skeleton, which chemists became interested in well before it was found in Nature. Because of its structure and biological activity, the natural product has been targeted for synthesis on numerous occasions, employing a wide range of different strategies. Hence, discussed here are aspects related to the isolation of isocryptolepine, as well as the various approaches toward its total synthesis.
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Affiliation(s)
- Elida N Thobokholt
- Instituto de Química Rosario (IQUIR, CONICET-UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario Suipacha 531 S2002LRK Rosario Argentina +54-341-4370477 +54-341-4370477
| | - Enrique L Larghi
- Instituto de Química Rosario (IQUIR, CONICET-UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario Suipacha 531 S2002LRK Rosario Argentina +54-341-4370477 +54-341-4370477
| | - Andrea B J Bracca
- Instituto de Química Rosario (IQUIR, CONICET-UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario Suipacha 531 S2002LRK Rosario Argentina +54-341-4370477 +54-341-4370477
| | - Teodoro S Kaufman
- Instituto de Química Rosario (IQUIR, CONICET-UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario Suipacha 531 S2002LRK Rosario Argentina +54-341-4370477 +54-341-4370477
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12
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Beckmann rearrangement: Thiamine hydrochloride as a remarkable catalyst for one-pot synthesis of amides from ketones. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.151859] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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13
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Yuan S, Chang J, Yu B. Construction of Biologically Important Biaryl Scaffolds through Direct C–H Bond Activation: Advances and Prospects. Top Curr Chem (Cham) 2020; 378:23. [DOI: 10.1007/s41061-020-0285-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Accepted: 01/21/2020] [Indexed: 11/30/2022]
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14
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Abstract
The Beckmann rearrangement is an elegant transformation and has been used to great success in the synthesis of natural products and pharmaceuticals. In this review, the role of different catalysts as well as different medium for Beckmann rearrangement has been discussed over the last 20 years.
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Affiliation(s)
- Kamalpreet Kaur
- Department of Applied Sciences
- National Institute of Technology
- Narela
- India
| | - Suman Srivastava
- Department of Applied Sciences
- National Institute of Technology
- Narela
- India
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15
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Gao Y, Zhang Z, Li Z, Guo T, Zhu Y, Yao Z, Liu B, Li Y, Guo K. 4,5-Dioxo-imidazolinium Cation Activation of 1-Acyl-1-carbamoyl Oximes: Access to Cyanoformamides Using Dichloroimidazolidinedione. J Org Chem 2019; 85:1087-1096. [DOI: 10.1021/acs.joc.9b02992] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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16
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Munnuri S, Verma S, Chandra D, Anugu RR, Falck JR, Jat JL. Cu(OTf) 2-catalyzed Beckmann Rearrangement of Ketones Using Hydroxylamine -O-sulfonic Acid (HOSA). SYNTHESIS-STUTTGART 2019; 51:3709-3714. [PMID: 32684655 PMCID: PMC7367085 DOI: 10.1055/s-0039-1690005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The Beckmann Rearrangement (BKR) of ketones to secondary amides often requires harsh reaction conditions that limit its practicality and scope. Herein, we describe the Cu(OTf)2-catalyzed BKR of ketones under mild reaction conditions using hydroxylamine-O-sulfonic acid (HOSA), a commercial water soluble aminating agent. This method is compatible with most functional groups and directly provides the desired amides in good to excellent yields.
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Affiliation(s)
- Sailu Munnuri
- Division of Chemistry, Department of Biochemistry, UT Southwestern Medical Center, Dallas, TX, USA
| | - Saumya Verma
- Department of Chemistry, Babasaheb Bhimrao Ambedkar University (A Central University), Lucknow, India
| | - Dinesh Chandra
- Department of Chemistry, Babasaheb Bhimrao Ambedkar University (A Central University), Lucknow, India
| | - Raghunath Reddy Anugu
- Division of Chemistry, Department of Biochemistry, UT Southwestern Medical Center, Dallas, TX, USA
| | - John R. Falck
- Division of Chemistry, Department of Biochemistry, UT Southwestern Medical Center, Dallas, TX, USA
| | - Jawahar L. Jat
- Department of Chemistry, Babasaheb Bhimrao Ambedkar University (A Central University), Lucknow, India
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17
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Yang L, Liu Z, Li Y, Lei N, Shen Y, Zheng K. Electrochemically Enabled C3-Formylation and -Acylation of Indoles with Aldehydes. Org Lett 2019; 21:7702-7707. [PMID: 31553193 DOI: 10.1021/acs.orglett.9b02433] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Reported herein is an effective strategy for oxidative cross-coupling of indoles with various aldehydes. The strategy is based on a two-step transformation via a well-known Mannich-type reaction and a C-N bond cleavage for carbonyl introduction. The key step-the C-N bond cleavage of the Mannich product-was enabled by electrochemistry. This strategy (with over 40 examples) ensures excellent functional-group tolerance as well as late-stage functionalization of pharmaceutical molecules.
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Affiliation(s)
- Liquan Yang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P. R. China
| | - Zhaoran Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P. R. China
| | - Yujun Li
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P. R. China
| | - Ning Lei
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P. R. China
| | - Yanling Shen
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P. R. China
| | - Ke Zheng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , P. R. China
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18
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Zhang G, Zhao Y, Xuan L, Ding C. SO2
F2
-Activated Efficient Beckmann Rearrangement of Ketoximes for Accessing Amides and Lactams. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900844] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Guofu Zhang
- College of Chemical Engineering; Zhejiang University of Technology; 310014 Hangzhou P. R. China
| | - Yiyong Zhao
- College of Chemical Engineering; Zhejiang University of Technology; 310014 Hangzhou P. R. China
| | - Lidi Xuan
- College of Chemical Engineering; Zhejiang University of Technology; 310014 Hangzhou P. R. China
| | - Chengrong Ding
- College of Chemical Engineering; Zhejiang University of Technology; 310014 Hangzhou P. R. China
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19
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Mapping the reactivity of the quinoline ring-system – Synthesis of the tetracyclic ring-system of isocryptolepine and regioisomers. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.04.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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20
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Aksenov NA, Gasanova AZ, Abakarov GM, Aksenova IV, Aksenov AV. Novel convenient one-pot method for the synthesis of indoloquinolines. Russ Chem Bull 2019. [DOI: 10.1007/s11172-019-2493-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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21
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Chen Y, Cantillo D, Kappe CO. Visible Light-Promoted Beckmann Rearrangements: Separating Sequential Photochemical and Thermal Phenomena in a Continuous Flow Reactor. European J Org Chem 2019; 2019:2163-2171. [PMID: 31423105 PMCID: PMC6686973 DOI: 10.1002/ejoc.201900231] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Indexed: 12/04/2022]
Abstract
The Beckmann rearrangement of oximes to amides typically requires strong acids or highly reactive, hazardous electrophiles and/or elevated temperatures to proceed. A very attractive alternative is the in situ generation of Vilsmeier-Haack reagents, by means of photoredox catalysis, as promoters for the thermal Beckmann rearrangement. Investigation of the reaction parameters for this light-induced method using a one-pot strategy has shown that the reaction is limited by the different temperatures required for each of the two sequential steps. Using a continuous flow reactor, the photochemical and thermal processes have been separated by integrating a flow photoreactor unit at low temperature for the electrophile generation with a second reactor unit, at high temperature, where the rearrangement takes place. This strategy has enabled excellent conversions and yields for a diverse set of oximes, minimizing the formation of side products obtained with the original one-pot method.
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Affiliation(s)
- Yuesu Chen
- Research Center Pharmaceutical Engineering GmbH (RCPE)Center for Continuous Flow Synthesis and Processing (CC FLOW)Inffeldgasse 138010, GrazAustria
- Institute of ChemistryUniversity of GrazHeinrichstrasse 288010, GrazAustria
| | - David Cantillo
- Research Center Pharmaceutical Engineering GmbH (RCPE)Center for Continuous Flow Synthesis and Processing (CC FLOW)Inffeldgasse 138010, GrazAustria
- Institute of ChemistryUniversity of GrazHeinrichstrasse 288010, GrazAustria
| | - C. Oliver Kappe
- Research Center Pharmaceutical Engineering GmbH (RCPE)Center for Continuous Flow Synthesis and Processing (CC FLOW)Inffeldgasse 138010, GrazAustria
- Institute of ChemistryUniversity of GrazHeinrichstrasse 288010, GrazAustria
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22
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Xie LN, Shao J, Huang CH, Li F, Xu D, Kalyanaraman B, Zhu BZ. An unusual double radical homolysis mechanism for the unexpected activation of the aldoxime nerve-agent antidotes by polyhalogenated quinoid carcinogens under normal physiological conditions. Free Radic Biol Med 2019; 130:1-7. [PMID: 30352302 DOI: 10.1016/j.freeradbiomed.2018.10.425] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 10/12/2018] [Accepted: 10/13/2018] [Indexed: 01/21/2023]
Abstract
We have recently shown that the pyridinium aldoximes, best-known as therapeutic antidotes for chemical warfare nerve-agents, could markedly detoxify the carcinogenic tetrachloro-1,4-benzoquinone (TCBQ) via an unusual double Beckmann fragmentation mechanism. However, it is still not clear why pralidoxime (2-PAM) cannot provide full protection against TCBQ-induced biological damages even when 2-PAM was in excess. Here we show, unexpectedly, that TCBQ can also activate pralidoxime to generate a reactive iminyl radical intermediate in two-consecutive steps, which was detected and unequivocally characterized by the complementary application of ESR spin-trapping, HPLC/MS and nitrogen-15 isotope-labeling studies. The same iminyl radical was observed when TCBQ was substituted by other halogenated quinones. The end product of iminyl radical was isolated and identified as its corresponding reactive and toxic aldehyde. Based on these data, we proposed that the reaction of 2-PAM and TCBQ might be through the following two competing pathways: a nucleophilic attack of 2-PAM on TCBQ forms an unstable transient intermediate, which can decompose not only heterolytically to form 2-CMP via double Beckmann fragmentation, but also homolytically leading to the formation of a reactive iminyl radical in double-steps, which then via H abstraction and further hydrolyzation to form its corresponding more toxic aldehyde. Analogous radical homolysis mechanism was observed with other halogenated quinones and pyridinium aldoximes. This study represents the first detection and identification of reactive iminyl radical intermediates produced under normal physiological conditions, which provides direct experimental evidence to explain only the partial protection by 2-PAM against TCBQ-induced biological damages, and also the potential side-toxic effects induced by 2-PAM and other pyridinium aldoxime nerve-agent antidotes.
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Affiliation(s)
- Lin-Na Xie
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Jie Shao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Chun-Hua Huang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Feng Li
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Dan Xu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | | | - Ben-Zhan Zhu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
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23
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Hyodo K, Hasegawa G, Oishi N, Kuroda K, Uchida K. Direct and Catalytic Amide Synthesis from Ketones via Transoximation and Beckmann Rearrangement under Mild Conditions. J Org Chem 2018; 83:13080-13087. [DOI: 10.1021/acs.joc.8b01810] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kengo Hyodo
- Department of Material Chemistry, Faculty of Science and Technology, Ryukoku University, Seta, Otsu, Shiga 520-2194, Japan
| | - Genna Hasegawa
- Department of Material Chemistry, Faculty of Science and Technology, Ryukoku University, Seta, Otsu, Shiga 520-2194, Japan
| | - Naoki Oishi
- Department of Material Chemistry, Faculty of Science and Technology, Ryukoku University, Seta, Otsu, Shiga 520-2194, Japan
| | - Kazuma Kuroda
- Department of Material Chemistry, Faculty of Science and Technology, Ryukoku University, Seta, Otsu, Shiga 520-2194, Japan
| | - Kingo Uchida
- Department of Material Chemistry, Faculty of Science and Technology, Ryukoku University, Seta, Otsu, Shiga 520-2194, Japan
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24
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Li Z, Fang C, Zheng Y, Qiu G, Li X, Zhou H. Multicatalytic Beckmann rearrangement of 2-hydroxylarylketone oxime: Switchable synthesis of benzo[d]oxazoles and N-(2-hydroxylaryl)amides. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.09.043] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Dai J, Dan W, Zhang Y, Wang J. Recent developments on synthesis and biological activities of γ-carboline. Eur J Med Chem 2018; 157:447-461. [PMID: 30103193 DOI: 10.1016/j.ejmech.2018.08.015] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 06/28/2018] [Accepted: 08/04/2018] [Indexed: 11/28/2022]
Abstract
γ-Carboline alkaloids are a family of natural and synthetic agents that have diverse bioactivities including antiviral, antibacterial, antifungal, antiparasitic, antitumor, anti-inflammatory, neuropharmacological activities and so on. They constitute an important class of pharmacologically active scaffolds that exhibit biological activity via diverse mechanisms. This review provides an update on the recent developments (2010-2017) in the synthesis and biological activities of these compounds. In cases where sufficient information is available, the mechanism and the structure-activity relationship (SAR) of biological activity are presented, and based on our expertise in the field and careful analysis of the recent literature, for the potential of γ-carboline alkaloids as medicinal drugs is proposed.
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Affiliation(s)
- Jiangkun Dai
- College of Chemistry & Pharmacy, Northwest A&F University, 22 Xinong Road, Yangling 712100, Shaanxi, China
| | - Wenjia Dan
- College of Chemistry & Pharmacy, Northwest A&F University, 22 Xinong Road, Yangling 712100, Shaanxi, China
| | - Yunyun Zhang
- College of Chemistry & Pharmacy, Northwest A&F University, 22 Xinong Road, Yangling 712100, Shaanxi, China
| | - Junru Wang
- College of Chemistry & Pharmacy, Northwest A&F University, 22 Xinong Road, Yangling 712100, Shaanxi, China; State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Zhangjiang Hi-Tech Park, 201203, Shanghai, China.
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26
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Affiliation(s)
| | - Giuseppe Zanoni
- Dipartimento di Chimica; Università di Pavia; Viale Taramelli 10 27100 Pavia Italy
| | - Debabrata Maiti
- Department of Chemistry; IIT Bombay; Powai Mumbai 400076 India
- Dipartimento di Chimica; Università di Pavia; Viale Taramelli 10 27100 Pavia Italy
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27
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Chen WT, Wei WT. Recent Developments in the C(sp3
)−H Functionalization of 2-Oxindoles through Radical Reactions. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800209] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Wei-Ting Chen
- School of Materials Science and Chemical Engineering; Ningbo University; Ningbo 315211 P. R. China
| | - Wen-Ting Wei
- School of Materials Science and Chemical Engineering; Ningbo University; Ningbo 315211 P. R. China
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28
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Dalal DS, Patil DR, Tayade YA. β‐Cyclodextrin: A Green and Efficient Supramolecular Catalyst for Organic Transformations. CHEM REC 2018; 18:1560-1582. [DOI: 10.1002/tcr.201800016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 05/07/2018] [Indexed: 12/16/2022]
Affiliation(s)
- Dipak S. Dalal
- Department of Organic Chemistry, School of Chemical SciencesNorth Maharashtra University Jalgaon – 425 001 (M. S.) India
| | - Dipak R. Patil
- Department of Organic Chemistry, School of Chemical SciencesNorth Maharashtra University Jalgaon – 425 001 (M. S.) India
| | - Yogesh A. Tayade
- Department of Organic Chemistry, School of Chemical SciencesNorth Maharashtra University Jalgaon – 425 001 (M. S.) India
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29
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Tang S, Yang SW, Sun H, Zhou Y, Li J, Zhu Q. Pd-Catalyzed Divergent C(sp2)–H Activation/Cycloimidoylation of 2-Isocyano-2,3-diarylpropanoates. Org Lett 2018. [PMID: 29522342 DOI: 10.1021/acs.orglett.8b00346] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Shi Tang
- State Key Laboratory of Respiratory Disease, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 190 Kaiyuan Avenue, Guangzhou 510530, China
| | - Sheng-Wen Yang
- Department of Chemistry, Jinan University, Huangpu Road West 601, Guangzhou 510632, China
| | - Hongwei Sun
- State Key Laboratory of Respiratory Disease, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 190 Kaiyuan Avenue, Guangzhou 510530, China
| | - Yali Zhou
- State Key Laboratory of Respiratory Disease, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 190 Kaiyuan Avenue, Guangzhou 510530, China
| | - Juan Li
- Department of Chemistry, Jinan University, Huangpu Road West 601, Guangzhou 510632, China
| | - Qiang Zhu
- State Key Laboratory of Respiratory Disease, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 190 Kaiyuan Avenue, Guangzhou 510530, China
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30
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Gao Y, Liu J, Li Z, Guo T, Xu S, Zhu H, Wei F, Chen S, Gebru H, Guo K. Dichloroimidazolidinedione-Activated Beckmann Rearrangement of Ketoximes for Accessing Amides and Lactams. J Org Chem 2018; 83:2040-2049. [DOI: 10.1021/acs.joc.7b02983] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yu Gao
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Jingjing Liu
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Zhenjiang Li
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Tianfo Guo
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Songquan Xu
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Hui Zhu
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Fulan Wei
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Siming Chen
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Hailemariam Gebru
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
| | - Kai Guo
- State Key Laboratory of Materials-Oriented
Chemical Engineering, College of Biotechnology and Pharmaceutical
Engineering, Nanjing Tech University, 30 Puzhu Road South, Nanjing 211816, China
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31
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Kiely-Collins HJ, Sechi I, Brennan PE, McLaughlin MG. Mild, calcium catalysed Beckmann rearrangements. Chem Commun (Camb) 2018; 54:654-657. [DOI: 10.1039/c7cc09491d] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A mild calcium catalysed Beckmann rearrangement has been realised, which forgoes the more traditional harsh reactions conditions associated with the transformation.
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Affiliation(s)
- H. J. Kiely-Collins
- Structural Genomics Consortium & Target Discovery Institute, University of Oxford, NDM Research Building
- Oxford
- UK
| | - I. Sechi
- Structural Genomics Consortium & Target Discovery Institute, University of Oxford, NDM Research Building
- Oxford
- UK
| | - P. E. Brennan
- Structural Genomics Consortium & Target Discovery Institute, University of Oxford, NDM Research Building
- Oxford
- UK
- ARUK Oxford Drug Discovery Institute, University of Oxford Oxford
- UK
| | - M. G. McLaughlin
- Structural Genomics Consortium & Target Discovery Institute, University of Oxford, NDM Research Building
- Oxford
- UK
- Faculty of Science & Engineering, Division of Chemistry & Environmental Science, Manchester Metropolitan University
- Manchester
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32
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Zhang TY, Liu C, Chen C, Liu JX, Xiang HY, Jiang W, Ding TM, Zhang SY. Copper-Mediated Cascade C–H/N–H Annulation of Indolocarboxamides with Arynes: Construction of Tetracyclic Indoloquinoline Alkaloids. Org Lett 2017; 20:220-223. [DOI: 10.1021/acs.orglett.7b03580] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
| | | | | | | | | | - Wei Jiang
- School of Chemistry & Environmental Engineering, International Healthcare Innovation Institute, Wuyi University, Jiangmen 529020, China
| | | | - Shu-Yu Zhang
- School of Chemistry & Environmental Engineering, International Healthcare Innovation Institute, Wuyi University, Jiangmen 529020, China
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33
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Yi N, Li J, Zhang H, Wang R, Jiang J, Deng W, Zeng Z, Xiang J. Synthesis of 3-acylated indoles through iron-catalyzed oxidative coupling of indoles with α-amino carbonyl compounds. SYNTHETIC COMMUN 2017. [DOI: 10.1080/00397911.2017.1364767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Niannian Yi
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, P. R. China
| | - Jinxia Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, P. R. China
| | - Hao Zhang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, P. R. China
| | - Ruijia Wang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, P. R. China
| | - Jun Jiang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, P. R. China
| | - Wei Deng
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, P. R. China
| | - Zebing Zeng
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, P. R. China
| | - Jiannan Xiang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, P. R. China
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34
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Chakrabarti K, Maji M, Panja D, Paul B, Shee S, Das GK, Kundu S. Utilization of MeOH as a C1 Building Block in Tandem Three-Component Coupling Reaction. Org Lett 2017; 19:4750-4753. [DOI: 10.1021/acs.orglett.7b02105] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kaushik Chakrabarti
- Department
of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
| | - Milan Maji
- Department
of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
| | - Dibyajyoti Panja
- Department
of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
| | - Bhaskar Paul
- Department
of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
| | - Sujan Shee
- Department
of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
| | - Gourab Kanti Das
- Department
of Chemistry, Visva Bharati University, Santiniketan, West Bengal 731235, India
| | - Sabuj Kundu
- Department
of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
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35
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Murugan A, Vidyacharan S, Ghosh R, Sharada DS. Metal-Free Regioselective Dual C-H Functionalization in a Cascade Fashion: Access to Isocryptolepine Alkaloid Analogues. ChemistrySelect 2017. [DOI: 10.1002/slct.201700263] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Arumugavel Murugan
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi Sangareddy-502 285, Telangana INDIA
| | - Shinde Vidyacharan
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi Sangareddy-502 285, Telangana INDIA
| | - Ruma Ghosh
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi Sangareddy-502 285, Telangana INDIA
| | - Duddu S. Sharada
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi Sangareddy-502 285, Telangana INDIA
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36
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Wang S, Guo YQ, Ren ZH, Wang YY, Guan ZH. K 2CO 3-Mediated Cyclization and Rearrangement of γ,δ-Alkynyl Oximes To Form Pyridols. Org Lett 2017; 19:1574-1577. [PMID: 28290703 DOI: 10.1021/acs.orglett.7b00389] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A novel K2CO3-mediated cyclization and rearrangement of γ,δ-alkynyl oximes for the synthesis of pyridols is described. The process accomplishes an efficient [1,3] rearrangement of the O-vinyl oxime intermediate which is in situ generated from the intramolecular nucleophilic addition of γ,δ-alkynyl oximes. The reaction employs readily accessible starting materials, tolerates a wide range of functional groups, and gives a variety of synthetically challenging pyridols in good yields.
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Affiliation(s)
- Shun Wang
- Key Laboratory of Synthetic and Nature Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University , Xi'an 710127, P. R. China
| | - Yong-Qiang Guo
- Key Laboratory of Synthetic and Nature Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University , Xi'an 710127, P. R. China
| | - Zhi-Hui Ren
- Key Laboratory of Synthetic and Nature Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University , Xi'an 710127, P. R. China
| | - Yao-Yu Wang
- Key Laboratory of Synthetic and Nature Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University , Xi'an 710127, P. R. China
| | - Zheng-Hui Guan
- Key Laboratory of Synthetic and Nature Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University , Xi'an 710127, P. R. China
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37
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Fernández-Stefanuto V, Verdía P, Tojo E. A new procedure to obtain ε-caprolactam catalyzed by a guanidinium salt. NEW J CHEM 2017. [DOI: 10.1039/c7nj03443a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new procedure to prepare ε-caprolactam by the Beckmann rearrangement of cyclohexanone oxime is described.
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Affiliation(s)
| | - P. Verdía
- University of Vigo
- Department of Organic Chemistry
- Marcosende
- Spain
| | - E. Tojo
- University of Vigo
- Department of Organic Chemistry
- Marcosende
- Spain
| |
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