1
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Asano A, Kawanami Y, Fujita M, Yano Y, Ide R, Minoura K, Kato T, Doi M. Electronic substituent effect on the conformation of a phenylalanine-incorporated cyclic peptide. RSC Adv 2024; 14:1062-1071. [PMID: 38174232 PMCID: PMC10759965 DOI: 10.1039/d3ra07836a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Accepted: 12/19/2023] [Indexed: 01/05/2024] Open
Abstract
The Phe-incorporated cyclic peptide [cyclo(-Phe1-oxazoline2-d-Val3-thiazole4-Ile5-oxazoline6-d-Val7-thiazole8-)] is in a conformational equilibrium between square and folded forms in solution. In the folded form, a CH⋯π interaction between the Phe1 aromatic ring and the Oxz2 methyl group is observed. We endeavored to control the local conformation and thus modulate the CH⋯π interaction and flexibility of the Phe1 side chain by controlling the electronic substituent effects at the 4-position of the aromatic ring of the Phe1 residue. The effect of the 4-substituent on the global conformation was indicated by the linear relationship between the conformational free energies (ΔGo) determined through NMR-based quantification and the Hammett constants (σ). Electron-donating substituents, which had relatively strong CH⋯π interactions, promoted peptide folding by restraining the loss in entropy. Local control by the 4-substituent effects suggested that the Phe side chain exerts an entropic influence on the folding of these cyclic peptides.
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Affiliation(s)
- Akiko Asano
- Faculty of Pharmacy, Osaka Medical and Pharmaceutical University 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan +81-72-690-1005 +81-72-690-1066
| | - Yukiko Kawanami
- Faculty of Pharmacy, Osaka Medical and Pharmaceutical University 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan +81-72-690-1005 +81-72-690-1066
| | - Mao Fujita
- Faculty of Pharmacy, Osaka Medical and Pharmaceutical University 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan +81-72-690-1005 +81-72-690-1066
| | - Yuta Yano
- Faculty of Pharmacy, Osaka Medical and Pharmaceutical University 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan +81-72-690-1005 +81-72-690-1066
| | - Rio Ide
- Faculty of Pharmacy, Osaka Medical and Pharmaceutical University 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan +81-72-690-1005 +81-72-690-1066
| | - Katsuhiko Minoura
- Faculty of Pharmacy, Osaka Medical and Pharmaceutical University 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan +81-72-690-1005 +81-72-690-1066
| | - Takuma Kato
- Faculty of Pharmacy, Osaka Medical and Pharmaceutical University 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan +81-72-690-1005 +81-72-690-1066
| | - Mitsunobu Doi
- Faculty of Pharmacy, Osaka Medical and Pharmaceutical University 4-20-1 Nasahara, Takatsuki Osaka 569-1094 Japan +81-72-690-1005 +81-72-690-1066
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2
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Kim J, Lee JK, Moon B, Lee A. Photocatalytic Alkyl Addition to Access Quaternary Alkynyl α-Amino Esters. Org Lett 2022; 24:8870-8874. [PMID: 36414400 DOI: 10.1021/acs.orglett.2c03669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
A regioselective alkylation of β,γ-alkynyl-α-imino esters by visible-light photocatalysis has been developed. This method enables 1,2-addition of methyl, primary, secondary, and tertiary alkyl radicals to the conjugated imines under mild conditions to produce a variety of quaternary alkynyl α-amino acid and cyclic amino acid motifs. Alkyl radicals are generated from alkyl bis(catecholato)silicates with an organic photocatalyst. This process is effective under an air atmosphere, providing operational benefits compared to conventional alkylation using organometallic reagents.
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Affiliation(s)
- Juyeong Kim
- Brain Science Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea.,Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea
| | - Jae Kyun Lee
- Brain Science Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Bongjin Moon
- Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea
| | - Ansoo Lee
- Brain Science Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea.,Division of Bio-Medical Science & Technology, KIST School, University of Science and Technology, Seoul 02792, Republic of Korea
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3
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Screening of small molecule libraries using combined text mining, ligand- and target-driven based approaches for identification of novel granzyme H inhibitors. J Mol Graph Model 2021; 105:107876. [PMID: 33744783 DOI: 10.1016/j.jmgm.2021.107876] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 02/17/2021] [Accepted: 02/18/2021] [Indexed: 11/23/2022]
Abstract
Granzymes are serine proteases synthesized by CTL and NK cells. Five granzyme genes (GzmA, -B, -H, -K, -M) are present in humans, which are located at three different chromosomal loci. Being serine proteases, the binding pocket constitutes a catalytic triad (i.e., His59, Asp103 and Ser197). Granzymes are released into target (cancerous and virally infected) cells by a specialized process known as granule exocytosis pathway. After internalization, these proteases initiate apoptosis. Granzymes are also involved in other non-apoptotic immune associated roles like ECM remodeling, cytokine modulation, killing of pathogens through generation of phagosomes. Their intracellular activity is regulated by specialized inhibitors knows as SERPINs. However, if these proteases are secreted in excess into the extracellular environment, their regulation becomes important as otherwise they start self-damage to the tissues thereby worsening the disease conditions. Efforts are being made to identify potential inhibitors for regulation of these proteases in an extracellular environment. Physiological and synthetic inhibitors have been reported against some members however there is no known inhibitor against extracellular human GzmH. Thus, in the current study, we investigated small molecule databases for the identification of potential molecules having the ability to inhibit GzmH by combined molecular simulations, which can ultimately be used as a potential therapeutic agent.
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4
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Cao HQ, Liu HN, Liu ZY, Qiao B, Zhang FG, Ma JA. Silver-Promoted Direct Phosphorylation of Bulky C(sp 2)-H Bond to Build Fully Substituted β-Phosphonodehydroamino Acids. Org Lett 2020; 22:6414-6419. [PMID: 32806196 DOI: 10.1021/acs.orglett.0c02229] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A general and practical cross-dehydrogenative coupling protocol between readily available trisubstituted α,β-dehydro α-amino carboxylic esters and H-phosphites is described. This C(sp2)-H phosphorylation reaction proceeds with absolute Z-selectivity promoted by silver salt in a radical relay manner. The bulky tetrasubstituted β-phosphonodehydroamino acids were obtained in grams and added new modules to the toolkit for peptide modifications.
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Affiliation(s)
- Hao-Qiang Cao
- Department of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Frontiers Science Center for Synthetic Biology (Ministry of Education), and Tianjin Collaborative Innovation Center of Chemical Science & Engineering, Tianjin University, Tianjin, 350072, P.R. China.,Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, P.R. China
| | - Hao-Nan Liu
- Department of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Frontiers Science Center for Synthetic Biology (Ministry of Education), and Tianjin Collaborative Innovation Center of Chemical Science & Engineering, Tianjin University, Tianjin, 350072, P.R. China.,Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, P.R. China
| | - Zhe-Yuan Liu
- Department of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Frontiers Science Center for Synthetic Biology (Ministry of Education), and Tianjin Collaborative Innovation Center of Chemical Science & Engineering, Tianjin University, Tianjin, 350072, P.R. China.,Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, P.R. China
| | - Baokun Qiao
- Department of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Frontiers Science Center for Synthetic Biology (Ministry of Education), and Tianjin Collaborative Innovation Center of Chemical Science & Engineering, Tianjin University, Tianjin, 350072, P.R. China.,Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, P.R. China
| | - Fa-Guang Zhang
- Department of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Frontiers Science Center for Synthetic Biology (Ministry of Education), and Tianjin Collaborative Innovation Center of Chemical Science & Engineering, Tianjin University, Tianjin, 350072, P.R. China.,Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, P.R. China
| | - Jun-An Ma
- Department of Chemistry, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Frontiers Science Center for Synthetic Biology (Ministry of Education), and Tianjin Collaborative Innovation Center of Chemical Science & Engineering, Tianjin University, Tianjin, 350072, P.R. China.,Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, P.R. China
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5
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Yin H, Zheng M, Chen H, Wang S, Zhou Q, Zhang Q, Wang P. Stereoselective and Divergent Construction of β-Thiolated/Selenolated Amino Acids via Photoredox-Catalyzed Asymmetric Giese Reaction. J Am Chem Soc 2020; 142:14201-14209. [DOI: 10.1021/jacs.0c04994] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Hongli Yin
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People’s Republic of China
| | - Mengjie Zheng
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People’s Republic of China
| | - Huan Chen
- Department of Chemistry, University at Albany, State University of New York, 1400 Washington Avenue, Albany, New York 12222, United States
| | - Siyao Wang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People’s Republic of China
| | - Qingqing Zhou
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People’s Republic of China
| | - Qiang Zhang
- Department of Chemistry, University at Albany, State University of New York, 1400 Washington Avenue, Albany, New York 12222, United States
| | - Ping Wang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People’s Republic of China
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6
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Mizuno A, Matsui K, Shuto S. From Peptides to Peptidomimetics: A Strategy Based on the Structural Features of Cyclopropane. Chemistry 2017. [PMID: 28632330 DOI: 10.1002/chem.201702119] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Peptidomimetics, non-natural mimicries of bioactive peptides, comprise an important class of drug molecules. The essence of the peptidomimetic design is to mimic the key conformation assumed by the bioactive peptides upon binding to their targets. Regulation of the conformation of peptidomimetics is important not only to enhance target binding affinity and selectivity, but also to confer cell-membrane permeability for targeting protein-protein interactions in cells. The rational design of peptidomimetics with suitable three-dimensional structures is challenging, however, due to the inherent flexibility of peptides and their dynamic conformational changes upon binding to the target biomolecules. In this Minireview, a three-dimensional structural diversity-oriented strategy based on the characteristic structural features of cyclopropane to address this challenging issue in peptidomimetic chemistry is described.
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Affiliation(s)
- Akira Mizuno
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan
| | - Kouhei Matsui
- Pharmaceutical Research Center, Shionogi & Co., Ltd., 3-1-1, Futaba-cho, Toyonaka, Osaka, 561-0825, Japan
| | - Satoshi Shuto
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan.,Center for Research and Education on Drug Discovery, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo, Hokkaido, 060-0812, Japan
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7
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Zhao Y, Wang L, Zhao J. Chiral phosphoric acid catalyzed aza-Friedel-Crafts alkylation of indoles with cyclic aryl α-ketimino esters. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2016.12.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Yu JS, Zhou J. Organocatalytic enantioselective Mukaiyama–Mannich reaction of fluorinated enol silyl ethers and cyclic N-sulfonyl ketimines. Org Chem Front 2016. [DOI: 10.1039/c5qo00407a] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first catalytic asymmetric Mukaiyama–Mannich reaction of fluorinated silyl enol ethers and ketimines is developed, allowing highly enantioselective synthesis of benzosultam based β-fluorinated Cα-tetrasubstituted α-amino acid derivatives.
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Affiliation(s)
- Jin-Sheng Yu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- China
| | - Jian Zhou
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- China
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9
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10
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Marsini MA, Reeves JT, Desrosiers JN, Herbage MA, Savoie J, Li Z, Fandrick KR, Sader CA, McKibben B, Gao DA, Cui J, Gonnella NC, Lee H, Wei X, Roschangar F, Lu BZ, Senanayake CH. Diastereoselective Synthesis of α-Quaternary Aziridine-2-carboxylates via Aza-Corey–Chaykovsky Aziridination of N-tert-Butanesulfinyl Ketimino Esters. Org Lett 2015; 17:5614-7. [DOI: 10.1021/acs.orglett.5b02838] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Maurice A. Marsini
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Jonathan T. Reeves
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Jean-Nicolas Desrosiers
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Melissa A. Herbage
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Jolaine Savoie
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Zhibin Li
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Keith R. Fandrick
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - C. Avery Sader
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Bryan McKibben
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Donghong A. Gao
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Jianwen Cui
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Nina C. Gonnella
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Heewon Lee
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Xudong Wei
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Frank Roschangar
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Bruce Z. Lu
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
| | - Chris H. Senanayake
- Departments of Chemical Development,
Medicinal Chemistry, and Material and Analytical Sciences, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Ridgebury Road, Ridgefield, Connecticut 06877, United States
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11
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Doan ND, Lubell WD. X-ray structure analysis revealsβ-turn mimicry byN-amino-imidazolidin-2-ones†. Biopolymers 2015; 104:629-35. [DOI: 10.1002/bip.22646] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2015] [Revised: 03/02/2015] [Accepted: 03/07/2015] [Indexed: 11/07/2022]
Affiliation(s)
- Ngoc-Duc Doan
- Département de Chimie; Université de Montréal; C.P. 6128, Succursale Centre-Ville Montréal QC Canada H3C 3J7
- Department of Chemistry; Massachusetts Institute of Technology; 77 Massachusetts Avenue Cambridge MA 02139
| | - William D. Lubell
- Département de Chimie; Université de Montréal; C.P. 6128, Succursale Centre-Ville Montréal QC Canada H3C 3J7
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12
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de Meijere A, Kozhushkov SI, Yufit DS, Grosse C, Kaiser M, Raev VA. (2R,1'S,2'R)- and (2S,1'S,2'R)-3-[2-Mono(di,tri)fluoromethylcyclopropyl]alanines and their incorporation into hormaomycin analogues. Beilstein J Org Chem 2014; 10:2844-57. [PMID: 25550751 PMCID: PMC4273223 DOI: 10.3762/bjoc.10.302] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Accepted: 11/18/2014] [Indexed: 11/23/2022] Open
Abstract
Efficient and scalable syntheses of enantiomerically pure (2R,1'S,2'R)- and (2S,1'S,2'R)-3-[2-mono(di,tri)fluoromethylcyclopropyl]alanines 9a–c, as well as allo-D-threonine (4) and (2S,3R)-β-methylphenylalanine (3), using the Belokon' approach with (S)- and (R)-2-[(N-benzylprolyl)amino]benzophenone [(S)- and (R)-10] as reusable chiral auxiliaries have been developed. Three new fluoromethyl analogues of the naturally occurring octadepsipeptide hormaomycin (1) with (fluoromethylcyclopropyl)alanine moieties have been synthesized and subjected to preliminary tests of their antibiotic activity.
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Affiliation(s)
- Armin de Meijere
- Institut für Organische und Biomolekulare Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, 37077 Göttingen, Germany
| | - Sergei I Kozhushkov
- Institut für Organische und Biomolekulare Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, 37077 Göttingen, Germany
| | - Dmitrii S Yufit
- Department of Chemistry, University of Durham, South Rd., Durham DH1 3L, UK
| | - Christian Grosse
- Institut für Anorganische Chemie der Georg-August-Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Marcel Kaiser
- Swiss Tropical and Public Health Institute, Parasite Chemotherapy, Socinstrasse 57, CH-4002 Basel, Switzerland ; University of Basel, Petersplatz, 1 CH-4003 Basel Switzerland
| | - Vitaly A Raev
- Institut für Organische und Biomolekulare Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, 37077 Göttingen, Germany ; Institut für Organische Chemie der TU Carolo-Wilhelmina zu Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
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13
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Ilisz I, Gecse Z, Pataj Z, Fülöp F, Tóth G, Lindner W, Péter A. Direct high-performance liquid chromatographic enantioseparation of secondary amino acids on Cinchona alkaloid-based chiral zwitterionic stationary phases. Unusual temperature behavior. J Chromatogr A 2014; 1363:169-77. [DOI: 10.1016/j.chroma.2014.06.087] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 06/04/2014] [Accepted: 06/25/2014] [Indexed: 11/17/2022]
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14
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Proulx C, Lubell WD. Analysis ofN-amino-imidazolin-2-one peptide turn mimic 4-position substituent effects on conformation by X-ray crystallography. Biopolymers 2014; 102:7-15. [DOI: 10.1002/bip.22327] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2013] [Revised: 06/06/2013] [Accepted: 06/07/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Caroline Proulx
- Département de Chimie; Université de Montréal; C.P. 6128, Succursale Center-Ville Montréal QC H3C 3J7 Canada
| | - William D. Lubell
- Département de Chimie; Université de Montréal; C.P. 6128, Succursale Center-Ville Montréal QC H3C 3J7 Canada
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15
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Martín-Gago P, Aragón E, Gomez-Caminals M, Fernández-Carneado J, Ramón R, Martin-Malpartida P, Verdaguer X, López-Ruiz P, Colás B, Cortes MA, Ponsati B, Macias MJ, Riera A. Insights into structure-activity relationships of somatostatin analogs containing mesitylalanine. Molecules 2013; 18:14564-84. [PMID: 24287991 PMCID: PMC6270305 DOI: 10.3390/molecules181214564] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 11/12/2013] [Accepted: 11/13/2013] [Indexed: 12/29/2022] Open
Abstract
The non-natural amino acid mesitylalanine (2,4,6-trimethyl-L-phenylalanine; Msa) has an electron-richer and a more conformationally restricted side-chain than that of its natural phenylalanine counterpart. Taking these properties into account, we have synthesized ten somatostatin analogs containing Msa residues in different key positions to modify the intrinsic conformational flexibility of the natural hormone. We have measured the binding affinity of these analogs and correlated it with the main conformations they populate in solution. NMR and computational analysis revealed that analogs containing one Msa residue were conformationally more restricted than somatostatin under similar experimental conditions. Furthermore, we were able to characterize the presence of a hairpin at the pharmacophore region and a non-covalent interaction between aromatic residues 6 and 11. In all cases, the inclusion of a D-Trp in the eighth position further stabilized the main conformation. Some of these peptides bound selectively to one or two somatostatin receptors with similar or even higher affinity than the natural hormone. However, we also found that multiple incorporations of Msa residues increased the life span of the peptides in serum but with a loss of conformational rigidity and binding affinity.
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Affiliation(s)
- Pablo Martín-Gago
- Institute for Research in Biomedicine (IRB Barcelona) Baldiri Reixac, 10, Barcelona 08028, Spain; E-Mails: (P.M.-G.); (E.A.); (R.R.); (P.M.-M.); (X.V.)
| | - Eric Aragón
- Institute for Research in Biomedicine (IRB Barcelona) Baldiri Reixac, 10, Barcelona 08028, Spain; E-Mails: (P.M.-G.); (E.A.); (R.R.); (P.M.-M.); (X.V.)
| | - Marc Gomez-Caminals
- BCN Peptides S.A. Pol.Ind. Els Vinyets-Els Fogars, Sector II. Ctra. Comarcal 244, Km. 22, 08777 Sant Quintí de Mediona, Barcelona 08777, Spain; E-Mails: (M.G.-C.); (J.F.-C.); (B.P.)
| | - Jimena Fernández-Carneado
- BCN Peptides S.A. Pol.Ind. Els Vinyets-Els Fogars, Sector II. Ctra. Comarcal 244, Km. 22, 08777 Sant Quintí de Mediona, Barcelona 08777, Spain; E-Mails: (M.G.-C.); (J.F.-C.); (B.P.)
| | - Rosario Ramón
- Institute for Research in Biomedicine (IRB Barcelona) Baldiri Reixac, 10, Barcelona 08028, Spain; E-Mails: (P.M.-G.); (E.A.); (R.R.); (P.M.-M.); (X.V.)
- Departament de Química Orgànica, Universitat de Barcelona, Martí i Franqués, 1-11, Barcelona 08028, Spain
| | - Pau Martin-Malpartida
- Institute for Research in Biomedicine (IRB Barcelona) Baldiri Reixac, 10, Barcelona 08028, Spain; E-Mails: (P.M.-G.); (E.A.); (R.R.); (P.M.-M.); (X.V.)
| | - Xavier Verdaguer
- Institute for Research in Biomedicine (IRB Barcelona) Baldiri Reixac, 10, Barcelona 08028, Spain; E-Mails: (P.M.-G.); (E.A.); (R.R.); (P.M.-M.); (X.V.)
- Departament de Química Orgànica, Universitat de Barcelona, Martí i Franqués, 1-11, Barcelona 08028, Spain
| | - Pilar López-Ruiz
- Departamento de Bioquímica y Biología Molecular, Universidad de Alcalá de Henares, Facultad de Medicina, Madrid 28871, Spain; E-Mails: (P.L.-R.); (B.C.); (M.A.C.)
| | - Begoña Colás
- Departamento de Bioquímica y Biología Molecular, Universidad de Alcalá de Henares, Facultad de Medicina, Madrid 28871, Spain; E-Mails: (P.L.-R.); (B.C.); (M.A.C.)
| | - María Alicia Cortes
- Departamento de Bioquímica y Biología Molecular, Universidad de Alcalá de Henares, Facultad de Medicina, Madrid 28871, Spain; E-Mails: (P.L.-R.); (B.C.); (M.A.C.)
| | - Berta Ponsati
- BCN Peptides S.A. Pol.Ind. Els Vinyets-Els Fogars, Sector II. Ctra. Comarcal 244, Km. 22, 08777 Sant Quintí de Mediona, Barcelona 08777, Spain; E-Mails: (M.G.-C.); (J.F.-C.); (B.P.)
| | - Maria J. Macias
- Institute for Research in Biomedicine (IRB Barcelona) Baldiri Reixac, 10, Barcelona 08028, Spain; E-Mails: (P.M.-G.); (E.A.); (R.R.); (P.M.-M.); (X.V.)
- Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluis Companys, 23, Barcelona 08010, Spain
- Authors to whom correspondence should be addressed; E-Mails: (M.J.M.); (A.R.); Tel.: +34-934-037-189 (M.J.M.); Fax: +34-934-047-095 (M.J.M.); Tel. +34-934-047-093 (A.R.); Fax: +34-934-047-095 (A.R)
| | - Antoni Riera
- Institute for Research in Biomedicine (IRB Barcelona) Baldiri Reixac, 10, Barcelona 08028, Spain; E-Mails: (P.M.-G.); (E.A.); (R.R.); (P.M.-M.); (X.V.)
- Departament de Química Orgànica, Universitat de Barcelona, Martí i Franqués, 1-11, Barcelona 08028, Spain
- Authors to whom correspondence should be addressed; E-Mails: (M.J.M.); (A.R.); Tel.: +34-934-037-189 (M.J.M.); Fax: +34-934-047-095 (M.J.M.); Tel. +34-934-047-093 (A.R.); Fax: +34-934-047-095 (A.R)
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16
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Huang G, Yin Z, Zhang X. Construction of Optically Active Quaternary Propargyl Amines by Highly Enantioselective Zinc/BINOL-Catalyzed Alkynylation of Ketoimines. Chemistry 2013; 19:11992-8. [DOI: 10.1002/chem.201301479] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Indexed: 11/10/2022]
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17
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Hruby VJ, Cai M. Design of peptide and peptidomimetic ligands with novel pharmacological activity profiles. Annu Rev Pharmacol Toxicol 2013; 53:557-80. [PMID: 23294313 DOI: 10.1146/annurev-pharmtox-010510-100456] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Peptide hormones and neurotransmitters are of central importance in most aspects of intercellular communication and are involved in virtually all degenerative diseases. In this review, we discuss physicochemical approaches to the design of novel peptide and peptidomimetic agonists, antagonists, inverse agonists, and related compounds that have unique biological activity profiles, reduced toxic side effects, and, if desired, the ability to cross the blood-brain barrier. Designing ligands for specific biological and medical needs is emphasized, as is the close collaboration of chemists and biologists to maximize the chances for success. Special emphasis is placed on the use of conformational (ϕ-ψ space) and topographical (χ space) considerations in design.
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Affiliation(s)
- Victor J Hruby
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, USA.
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18
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Zhong Y, Xu J, Deng M, Liu B, Zhang F, Yuan Y, Yang X, Xu R. Generation of a human bone marrow-derived mesenchymal stem cell line expressing and secreting high levels of bioactive -melanocyte-stimulating hormone. J Biochem 2013; 153:371-379. [DOI: 10.1093/jb/mvt003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2023] Open
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19
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Mizuno A, Miura S, Watanabe M, Ito Y, Yamada S, Odagami T, Kogami Y, Arisawa M, Shuto S. Three-Dimensional Structural Diversity-Oriented Peptidomimetics Based on the Cyclopropylic Strain. Org Lett 2013; 15:1686-9. [DOI: 10.1021/ol400469w] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Akira Mizuno
- Faculty of Pharmaceutical Sciences, Center for Research and Education on Drug Discovery, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan, School of Pharmaceutical Sciences, University of Shizuoka, 52-1, Yata, Suruga-ku, Shizuoka 422-8526, Japan, PRISM BioLab Co., Ltd., 4259-3, Nagatsuta-cho, Midori-ku, Yokohama 226-8510, Japan, and D.D.P. Corporation, 1097-3, Kashiya, Kannami-cho, Shizuoka 419-0112, Japan
| | - Shiho Miura
- Faculty of Pharmaceutical Sciences, Center for Research and Education on Drug Discovery, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan, School of Pharmaceutical Sciences, University of Shizuoka, 52-1, Yata, Suruga-ku, Shizuoka 422-8526, Japan, PRISM BioLab Co., Ltd., 4259-3, Nagatsuta-cho, Midori-ku, Yokohama 226-8510, Japan, and D.D.P. Corporation, 1097-3, Kashiya, Kannami-cho, Shizuoka 419-0112, Japan
| | - Mizuki Watanabe
- Faculty of Pharmaceutical Sciences, Center for Research and Education on Drug Discovery, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan, School of Pharmaceutical Sciences, University of Shizuoka, 52-1, Yata, Suruga-ku, Shizuoka 422-8526, Japan, PRISM BioLab Co., Ltd., 4259-3, Nagatsuta-cho, Midori-ku, Yokohama 226-8510, Japan, and D.D.P. Corporation, 1097-3, Kashiya, Kannami-cho, Shizuoka 419-0112, Japan
| | - Yoshihiko Ito
- Faculty of Pharmaceutical Sciences, Center for Research and Education on Drug Discovery, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan, School of Pharmaceutical Sciences, University of Shizuoka, 52-1, Yata, Suruga-ku, Shizuoka 422-8526, Japan, PRISM BioLab Co., Ltd., 4259-3, Nagatsuta-cho, Midori-ku, Yokohama 226-8510, Japan, and D.D.P. Corporation, 1097-3, Kashiya, Kannami-cho, Shizuoka 419-0112, Japan
| | - Shizuo Yamada
- Faculty of Pharmaceutical Sciences, Center for Research and Education on Drug Discovery, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan, School of Pharmaceutical Sciences, University of Shizuoka, 52-1, Yata, Suruga-ku, Shizuoka 422-8526, Japan, PRISM BioLab Co., Ltd., 4259-3, Nagatsuta-cho, Midori-ku, Yokohama 226-8510, Japan, and D.D.P. Corporation, 1097-3, Kashiya, Kannami-cho, Shizuoka 419-0112, Japan
| | - Takenao Odagami
- Faculty of Pharmaceutical Sciences, Center for Research and Education on Drug Discovery, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan, School of Pharmaceutical Sciences, University of Shizuoka, 52-1, Yata, Suruga-ku, Shizuoka 422-8526, Japan, PRISM BioLab Co., Ltd., 4259-3, Nagatsuta-cho, Midori-ku, Yokohama 226-8510, Japan, and D.D.P. Corporation, 1097-3, Kashiya, Kannami-cho, Shizuoka 419-0112, Japan
| | - Yuji Kogami
- Faculty of Pharmaceutical Sciences, Center for Research and Education on Drug Discovery, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan, School of Pharmaceutical Sciences, University of Shizuoka, 52-1, Yata, Suruga-ku, Shizuoka 422-8526, Japan, PRISM BioLab Co., Ltd., 4259-3, Nagatsuta-cho, Midori-ku, Yokohama 226-8510, Japan, and D.D.P. Corporation, 1097-3, Kashiya, Kannami-cho, Shizuoka 419-0112, Japan
| | - Mitsuhiro Arisawa
- Faculty of Pharmaceutical Sciences, Center for Research and Education on Drug Discovery, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan, School of Pharmaceutical Sciences, University of Shizuoka, 52-1, Yata, Suruga-ku, Shizuoka 422-8526, Japan, PRISM BioLab Co., Ltd., 4259-3, Nagatsuta-cho, Midori-ku, Yokohama 226-8510, Japan, and D.D.P. Corporation, 1097-3, Kashiya, Kannami-cho, Shizuoka 419-0112, Japan
| | - Satoshi Shuto
- Faculty of Pharmaceutical Sciences, Center for Research and Education on Drug Discovery, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan, School of Pharmaceutical Sciences, University of Shizuoka, 52-1, Yata, Suruga-ku, Shizuoka 422-8526, Japan, PRISM BioLab Co., Ltd., 4259-3, Nagatsuta-cho, Midori-ku, Yokohama 226-8510, Japan, and D.D.P. Corporation, 1097-3, Kashiya, Kannami-cho, Shizuoka 419-0112, Japan
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Pandey AK, Naduthambi D, Thomas KM, Zondlo NJ. Proline editing: a general and practical approach to the synthesis of functionally and structurally diverse peptides. Analysis of steric versus stereoelectronic effects of 4-substituted prolines on conformation within peptides. J Am Chem Soc 2013; 135:4333-63. [PMID: 23402492 PMCID: PMC4209921 DOI: 10.1021/ja3109664] [Citation(s) in RCA: 133] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Functionalized proline residues have diverse applications. Herein we describe a practical approach, proline editing, for the synthesis of peptides with stereospecifically modified proline residues. Peptides are synthesized by standard solid-phase peptide synthesis to incorporate Fmoc-hydroxyproline (4R-Hyp). In an automated manner, the Hyp hydroxyl is protected and the remainder of the peptide synthesized. After peptide synthesis, the Hyp protecting group is orthogonally removed and Hyp selectively modified to generate substituted proline amino acids, with the peptide main chain functioning to "protect" the proline amino and carboxyl groups. In a model tetrapeptide (Ac-TYPN-NH2), 4R-Hyp was stereospecifically converted to 122 different 4-substituted prolyl amino acids, with 4R or 4S stereochemistry, via Mitsunobu, oxidation, reduction, acylation, and substitution reactions. 4-Substituted prolines synthesized via proline editing include incorporated structured amino acid mimetics (Cys, Asp/Glu, Phe, Lys, Arg, pSer/pThr), recognition motifs (biotin, RGD), electron-withdrawing groups to induce stereoelectronic effects (fluoro, nitrobenzoate), handles for heteronuclear NMR ((19)F:fluoro; pentafluorophenyl or perfluoro-tert-butyl ether; 4,4-difluoro; (77)SePh) and other spectroscopies (fluorescence, IR: cyanophenyl ether), leaving groups (sulfonate, halide, NHS, bromoacetate), and other reactive handles (amine, thiol, thioester, ketone, hydroxylamine, maleimide, acrylate, azide, alkene, alkyne, aryl halide, tetrazine, 1,2-aminothiol). Proline editing provides access to these proline derivatives with no solution-phase synthesis. All peptides were analyzed by NMR to identify stereoelectronic and steric effects on conformation. Proline derivatives were synthesized to permit bioorthogonal conjugation reactions, including azide-alkyne, tetrazine-trans-cyclooctene, oxime, reductive amination, native chemical ligation, Suzuki, Sonogashira, cross-metathesis, and Diels-Alder reactions. These proline derivatives allowed three parallel bioorthogonal reactions to be conducted in one solution.
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Affiliation(s)
- Anil K. Pandey
- Department of Chemistry and Biochemistry, University of Delaware, Newark DE 19716
| | - Devan Naduthambi
- Department of Chemistry and Biochemistry, University of Delaware, Newark DE 19716
| | - Krista M. Thomas
- Department of Chemistry and Biochemistry, University of Delaware, Newark DE 19716
| | - Neal J. Zondlo
- Department of Chemistry and Biochemistry, University of Delaware, Newark DE 19716
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21
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Synthesis of Peptides Employing Protected-Amino Acid Halides Mediated by Commercial Anion Exchange Resin. Int J Pept Res Ther 2013. [DOI: 10.1007/s10989-012-9337-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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22
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Zanuy D, Sayago FJ, Revilla-López G, Ballano G, Agemy L, Kotamraju VR, Jiménez AI, Cativiela C, Nussinov R, Sawvel AM, Stucky G, Ruoslahti E, Alemán C. Engineering strategy to improve peptide analogs: from structure-based computational design to tumor homing. J Comput Aided Mol Des 2013; 27:31-43. [PMID: 23239171 PMCID: PMC7553648 DOI: 10.1007/s10822-012-9623-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Accepted: 12/04/2012] [Indexed: 10/27/2022]
Abstract
We present a chemical strategy to engineer analogs of the tumor-homing peptide CREKA (Cys-Arg-Glu-Lys-Ala), which binds to fibrin and fibrin-associated clotted plasma proteins in tumor vessels (Simberg et al. in Proc Natl Acad Sci USA 104:932-936, 2007) with improved ability to inhibit tumor growth. Computer modeling using a combination of simulated annealing and molecular dynamics were carried out to design targeted replacements aimed at enhancing the stability of the bioactive conformation of CREKA. Because this conformation presents a pocket-like shape with the charged groups of Arg, Glu and Lys pointing outward, non-proteinogenic amino acids α-methyl and N-methyl derivatives of Arg, Glu and Lys were selected, rationally designed and incorporated into CREKA analogs. The stabilization of the bioactive conformation predicted by the modeling for the different CREKA analogs matched the tumor fluorescence results, with tumor accumulation increasing with stabilization. Here we report the modeling, synthetic procedures, and new biological assays used to test the efficacy and utility of the analogs. Combined, our results show how studies based on multi-disciplinary collaboration can converge and lead to useful biomedical advances.
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Affiliation(s)
- David Zanuy
- Department of Chemical Engineering, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, 08028 Barcelona, Spain.
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23
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Yusuff N, Doré M, Joud C, Visser M, Springer C, Xie X, Herlihy K, Porter D, Touré BB. Lipophilic Isosteres of a π-π Stacking Interaction: New Inhibitors of the Bcl-2-Bak Protein-Protein Interaction. ACS Med Chem Lett 2012; 3:579-83. [PMID: 24900514 DOI: 10.1021/ml300095a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Accepted: 05/27/2012] [Indexed: 12/14/2022] Open
Abstract
The discovery of new Bcl-2 protein-protein interaction antagonists is described. We replaced the northern fragment of ABT737 (π-π stacking interactions) with structurally simplified hydrophobic cage structures with much reduced conformational flexibility and rotational freedom. The binding mode of the compounds was elucidated by X-ray crystallography, and the compounds showed excellent oral bioavailability and clearance in rat PK studies.
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Affiliation(s)
- Naeem Yusuff
- Novartis Institutes for BioMedical Research
Inc., Global
Discovery Chemistry, 250 Massachusetts Avenue, Cambridge, Massachusetts
02139, United States
| | - Michaël Doré
- Novartis Institutes for BioMedical Research
Inc., Global
Discovery Chemistry, 250 Massachusetts Avenue, Cambridge, Massachusetts
02139, United States
| | - Carol Joud
- Novartis Institutes for BioMedical Research
Inc., Global
Discovery Chemistry, 250 Massachusetts Avenue, Cambridge, Massachusetts
02139, United States
| | - Michael Visser
- Novartis Institutes for BioMedical Research
Inc., Global
Discovery Chemistry, 250 Massachusetts Avenue, Cambridge, Massachusetts
02139, United States
| | - Clayton Springer
- Novartis Institutes for BioMedical Research
Inc., Global
Discovery Chemistry, 250 Massachusetts Avenue, Cambridge, Massachusetts
02139, United States
| | - Xiaoling Xie
- Novartis Institutes for BioMedical Research
Inc., Global
Discovery Chemistry, 250 Massachusetts Avenue, Cambridge, Massachusetts
02139, United States
| | - Kara Herlihy
- Novartis Institutes for BioMedical Research
Inc., Global
Discovery Chemistry, 250 Massachusetts Avenue, Cambridge, Massachusetts
02139, United States
| | - Dale Porter
- Novartis Institutes for BioMedical Research
Inc., Global
Discovery Chemistry, 250 Massachusetts Avenue, Cambridge, Massachusetts
02139, United States
| | - B. Barry Touré
- Novartis Institutes for BioMedical Research
Inc., Global
Discovery Chemistry, 250 Massachusetts Avenue, Cambridge, Massachusetts
02139, United States
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24
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Arnold JS, Cizio GT, Heitz DR, Nguyen HM. Rhodium-catalyzed regio- and enantioselective amination of racemic secondary allylic trichloroacetimidates with N-methyl anilines. Chem Commun (Camb) 2012; 48:11531-3. [DOI: 10.1039/c2cc36961c] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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26
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De Wachter R, de Graaf C, Keresztes A, Vandormael B, Ballet S, Tóth G, Rognan D, Tourwé D. Synthesis, Biological Evaluation, and Automated Docking of Constrained Analogues of the Opioid Peptide H-Dmt-d-Ala-Phe-Gly-NH2 Using the 4- or 5-Methyl Substituted 4-Amino-1,2,4,5-tetrahydro-2-benzazepin-3-one Scaffold. J Med Chem 2011; 54:6538-47. [DOI: 10.1021/jm2003574] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rien De Wachter
- Department of Organic Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium
| | - Chris de Graaf
- Structural Chemogenomics, UMR 7200 CNRS-UdS, Université de Strasbourg, Illkirch F-67401, France
- Leiden/Amsterdam Center for Drug Research, Division of Medicinal Chemistry, Faculty of Science, VU University Amsterdam, Amsterdam, The Netherlands
| | - Atilla Keresztes
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Bart Vandormael
- Department of Organic Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium
| | - Steven Ballet
- Department of Organic Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium
| | - Géza Tóth
- Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Szeged, Hungary
| | - Didier Rognan
- Structural Chemogenomics, UMR 7200 CNRS-UdS, Université de Strasbourg, Illkirch F-67401, France
| | - Dirk Tourwé
- Department of Organic Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium
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27
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Roiban GD, Serrano E, Soler T, Aullón G, Grosu I, Cativiela C, Martínez M, Urriolabeitia EP. Regioselective orthopalladation of (Z)-2-aryl-4-arylidene-5(4H)-oxazolones: scope, kinetico-mechanistic, and density functional theory studies of the C-H bond activation. Inorg Chem 2011; 50:8132-43. [PMID: 21806046 DOI: 10.1021/ic200564d] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Orthopalladated complexes derived from (Z)-2-aryl-4-arylidene-5(4H)-oxazolones have been prepared by reaction of the oxazolone with palladium acetate in acidic medium. The reaction is regioselective, only the ortho C-H bond of the arylidene ring being activated, producing a six-membered ring. The scope and reaction conditions of the orthopalladation are dependent on the acidity of the solvent. In CF(3)CO(2)H a large number of oxazolones can be metalated under mild conditions. As acidity decreases a lesser number of oxazolones can be efficiently palladated and harsher conditions must be used to achieve similar yields. The C-H bond activation in acidic medium agrees with an ambiphilic mechanism, as determined from kinetic measurements at variable temperature and pressure for different oxazolones substituted at the arylidene ring. The mechanism has been confirmed by density functional theory (DFT) calculations, where the formation of the six-membered ring is shown to be favored from both a kinetic and a thermodynamic perspective. In addition, the dependence of the reaction rate on the acidity of the medium has also been accounted for via a fine-tuning between the C-H agostic precoordination and the proton abstraction reaction in the overall process occurring on coordinatively saturated [Pd(κ(N)-oxazolone)(RCO(2)H)(3)](2+).
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Affiliation(s)
- Gheorghe-Doru Roiban
- Organic Chemistry Department, Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, 400028, Cluj-Napoca, Romania
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28
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Hruby VJ, Cai M, Cain J, Nyberg J, Trivedi D. Design of novel melanocortin receptor ligands: multiple receptors, complex pharmacology, the challenge. Eur J Pharmacol 2011; 660:88-93. [PMID: 21208601 PMCID: PMC3138524 DOI: 10.1016/j.ejphar.2010.10.109] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2010] [Revised: 10/05/2010] [Accepted: 10/16/2010] [Indexed: 11/22/2022]
Abstract
The major pharmacophore for the melanocortin 1, 3, 4 and 5 receptors is the sequence -His-Phe-Arg-Trp-. There is a need for potent, biologically stable, receptor selective ligands, both agonists and antagonists, for these receptors. In this report we briefly examine the structural and biophysical approaches we have taken to develop selective agonist and antagonist ligands that can cross (or not) the blood brain barrier. Remaining questions and unmet needs are also discussed.
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Affiliation(s)
- Victor J Hruby
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721, USA.
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29
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Cai M, Liu Z, Qu H, Fan H, Zheng Z, Hruby VJ. Utilize conjugated melanotropins for the earlier diagnosis and treatment of melanoma. Eur J Pharmacol 2011; 660:188-93. [PMID: 21315067 PMCID: PMC3095766 DOI: 10.1016/j.ejphar.2011.01.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Revised: 12/22/2010] [Accepted: 01/13/2011] [Indexed: 01/03/2023]
Abstract
Peptides serve as effective drugs and contrast agents in the clinic today. However the inherent drawbacks of peptide structures can limit their efficacy as drugs. To overcome this we have been developing new methods to create 'tailor-made' peptides and peptide mimetics with improved pharmacological and physical properties. In this work we introduce novel peptide and small molecule conjugated molecules for earlier diagnosis and treatment of melanoma.
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Affiliation(s)
- Minying Cai
- Department of Chemistry and Biochemistry, Tucson, Arizona 85721 U.S.A
| | - Zhonglin Liu
- Department of Radiology, University of Arizona, Tucson, Arizona 85721 U.S.A
| | - Hongchang Qu
- Department of Chemistry and Biochemistry, Tucson, Arizona 85721 U.S.A
| | - Helen Fan
- Department of Radiology, University of Arizona, Tucson, Arizona 85721 U.S.A
| | - Zhiping Zheng
- Department of Chemistry and Biochemistry, Tucson, Arizona 85721 U.S.A
| | - Victor J. Hruby
- Department of Chemistry and Biochemistry, Tucson, Arizona 85721 U.S.A
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30
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Chen P, Qu J. Backbone Modification of β-Hairpin-Forming Tetrapeptides in Asymmetric Acyl Transfer Reactions. J Org Chem 2011; 76:2994-3004. [DOI: 10.1021/jo200403g] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peng Chen
- State Key Laboratory and Institute of Elemento-organic Chemistry, Nankai University, Tianjin 300071, China
| | - Jin Qu
- State Key Laboratory and Institute of Elemento-organic Chemistry, Nankai University, Tianjin 300071, China
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31
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Kim SY, Kim SJ, Jang DO. Retracted: Enantioselective Radical Addition to Ketimines: A Synthetic Route Towards α,α-Disubstituted α-Amino Acids. Chemistry 2010; 16:13046-8. [DOI: 10.1002/chem.201002071] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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32
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Hartmann CE, Baumann T, Bächle M, Bräse S. Asymmetric synthesis of deuterated and fluorinated aromatic α,α-disubstituted amino acid derivatives. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.04.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Avenoza A, Busto JH, Canal N, Corzana F, Peregrina JM, Pérez-Fernández M, Rodríguez F. Cyclobutane amino acid analogues of furanomycin obtained by a formal [2 + 2] cycloaddition strategy promoted by methylaluminoxane. J Org Chem 2010; 75:545-52. [PMID: 20038109 DOI: 10.1021/jo9025258] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis and conformational analysis of a new type of conformationally restricted alpha-amino acid analogue of the amino acid antibiotic furanomycin is presented. The restriction involves the cis-fused cyclobutane and tetrahydrofuran units, generating the unusual 2-oxabicyclo[3.2.0]heptane core, which is found in a great number of biologically active natural products. The synthetic strategy is based on a formal [2 + 2] cycloaddition between 2-(acylamino)acrylates as acceptor alkenes and 2,3-dihydrofuran as a donor alkene, promoted by bulky aluminum-derived Lewis acids, particularly by methylaluminoxane (MAO). Additionally, following the same strategy, the synthesis of furanomycin analogues incorporating the 2-oxabicyclo[4.2.0]octane is reported.
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Affiliation(s)
- Alberto Avenoza
- Departamento de Quimica, Universidad de La Rioja, Grupo de Sintesis Quimica de La Rioja, U.A.-C.S.I.C., E-26006 Logrono, Spain.
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Abstract
From a scientific perspective, efforts to understand biology including what constitutes health and disease has become a chemical problem. However, chemists and biologists "see" the problems of understanding biology from different perspectives, and this has retarded progress in solving the problems especially as they relate to health and disease. This suggests that close collaboration between chemists and biologists is not only necessary but essential for progress in both the biology and chemistry that will provide solutions to the global questions of biology. This perspective has directed my scientific efforts for the past 45 years, and in this overview I provide my perspective of how the applications of synthetic chemistry, structural design, and numerous other chemical principles have intersected in my collaborations with biologists to provide new tools, new science, and new insights that were only made possible and fruitful by these collaborations.
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Affiliation(s)
- Victor J Hruby
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721, USA.
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Nieto S, Arnau P, Serrano E, Navarro R, Soler T, Cativiela C, Urriolabeitia EP. Functionalization of Methyl (R)-Phenylglycinate Through Orthopalladation: C−Hal, C−O, C−N, and C−C Bond Coupling. Inorg Chem 2009; 48:11963-75. [DOI: 10.1021/ic901941s] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sonia Nieto
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Palmira Arnau
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Elena Serrano
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Rafael Navarro
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Tatiana Soler
- Servicios Técnicos de Investigación, Facultad de Ciencias Fase II, Universidad de Alicante, 03690 San Vicente de Raspeig, Alicante, Spain
| | - Carlos Cativiela
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Esteban P. Urriolabeitia
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
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The preparation of optically active α-amino 4H-[1,2,4]oxadiazol-5-ones from optically active α-amino acids. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.09.045] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Fang WJ, Cui Y, Murray TF, Aldrich JV. Design, synthesis, and pharmacological activities of dynorphin A analogues cyclized by ring-closing metathesis. J Med Chem 2009; 52:5619-25. [PMID: 19715279 DOI: 10.1021/jm900577k] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Dynorphin A (Dyn A) is an endogenous ligand for kappa opioid receptors. To restrict the conformational mobility, we synthesized several cyclic Dyn A-(1-11)NH(2) analogues on solid phase utilizing ring-closing metathesis (RCM) between the side chains of allylglycine (AllGly) residues incorporated in positions 2, 5, and/or 8. Cyclizations between the side chains of AllGly gave reasonable yields (56-74%) of all of the desired cyclic peptides. Both the cis and trans isomers were obtained for all of the cyclic peptides, with the ratio of cis to trans isomers depending on the position and stereochemistry of the AllGly. Most of the cyclic Dyn A-(1-11)NH(2) analogues examined exhibit low nanomolar binding affinity for kappa opioid receptors (K(i) = 0.84-11 nM). In two of the three cases, the configuration of the double bond has a significant influence on the opioid receptor affinities and agonist potency. All of the peptides inhibited adenylyl cyclase activity in a concentration-dependent manner with full or close to full agonist activity. These potent Dyn A analogues are the first ones cyclized by RCM.
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Affiliation(s)
- Wei-Jie Fang
- Department of Medicinal Chemistry, The University of Kansas, Lawrence, Kansas 66045, USA
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38
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Sinisi R, Ghilardi A, Ruiu S, Lazzari P, Malpezzi L, Sani M, Pani L, Zanda M. Synthesis and in vitro Evaluation of Trifluoroethylamine Analogues of Enkephalins. ChemMedChem 2009; 4:1416-20. [DOI: 10.1002/cmdc.200900158] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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39
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Lukaszuk A, Demaegdt H, Feytens D, Vanderheyden P, Vauquelin G, Tourwé D. The Replacement of His(4) in Angiotensin IV by Conformationally Constrained Residues Provides Highly Potent and Selective Analogues. J Med Chem 2009; 52:5612-8. [DOI: 10.1021/jm900651p] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Aneta Lukaszuk
- Department of Organic Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
| | - Heidi Demaegdt
- Department of Molecular and Biochemical Pharmacology, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
| | - Debby Feytens
- Department of Organic Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
| | - Patrick Vanderheyden
- Department of Molecular and Biochemical Pharmacology, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
| | - Georges Vauquelin
- Department of Molecular and Biochemical Pharmacology, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
| | - Dirk Tourwé
- Department of Organic Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
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40
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Broda MA, Buczek A, Siodłak D, Rzeszotarska B. The effect of beta-methylation on the conformation of alpha, beta-dehydrophenylalanine: a DFT study. J Pept Sci 2009; 15:465-73. [PMID: 19408247 DOI: 10.1002/psc.1137] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Dehydroamino acids are non-coded amino acids that offer unique conformational properties. Dehydrophenylalanine (DeltaPhe) is most commonly used to modify bioactive peptides to constrain the topography of the phenyl ring in the side chain, which commonly serves as a pharmacophore. The Ramachandran maps (in the gas phase and in CHCl(3) mimicking environments) of DeltaPhe analogues with methyl groups at the beta position of the side chain as well as at the C-terminal amide were calculated using the B3LYP/6-31 + G** method. Unexpectedly, beta-methylation alone results in an increase of conformational freedom of the affected DeltaPhe residue. However, further modification by introducing an additional methyl group at C-terminal methyl amide results in a steric crowding that fixes the torsion angle psi of all conformers to the value 123 degrees , regardless of the Z or E position of the phenyl ring. The number of conformers is reduced and the accessible conformational space of the residues is very limited. In particular, (Z)-Delta(betaMe)Phe with the tertiary C-terminal amide can be classified as the amino acid derivative that has a single conformational state as it seems to adopt only the beta conformation.
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41
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Sawai Y, Mizuno M, Ito T, Kawakami JI, Yamano M. A practical synthesis of enantiopure β-methyltryptophan ethyl ester for a preparation of diabetes drug. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.06.027] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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42
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Operationally convenient asymmetric synthesis of (S)-2-amino-3,3-bis-(4-fluorophenyl)propanoic acid. J Fluor Chem 2009. [DOI: 10.1016/j.jfluchem.2009.03.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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43
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Zhdanko AG, Gulevich AV, Nenajdenko VG. One-step synthesis of N-acetylcysteine and glutathione derivatives using the Ugi reaction. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.04.030] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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44
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Abstract
The synthesis of a highly constrained quaternary carbocyclic α-amino acid, (+)-N-Boc-bicycloproline, has been achieved starting from sodium cyclopentadienylide. Key steps include a rhodium-catalyzed nitrenoid C-H insertion to install the tert-alkylamine and a ring-closing metathesis reaction to form the pyrrolidine ring.
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Affiliation(s)
- Sujeewa Ranatunga
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003
| | - Juan R. Del Valle
- Drug Discovery Department, Moffitt Cancer Center, 12902 Magnolia Drive, Tampa, FL 33647, USA
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45
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Zhdanko AG, Nenajdenko VG. Nonracemizable isocyanoacetates for multicomponent reactions. J Org Chem 2009; 74:884-7. [PMID: 19099419 DOI: 10.1021/jo802420c] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Chiral ortho esters of alpha-isocyano acids were synthesized from commercially available Cbz-protected alpha-amino acids. These compounds are stable toward racemization in the Ugi 4CC in contrast to known esters of alpha-isocyano acids. Applying them in Ugi 4CC with subsequent deprotection gives access to dipeptides with preserved configuration at the C-terminal amino acid.
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46
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Green JE, Bender DM, Jackson S, O’Donnell MJ, McCarthy JR. Mitsunobu Approach to the Synthesis of Optically Active α,α-Disubstituted Amino Acids. Org Lett 2009; 11:807-10. [DOI: 10.1021/ol802325h] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jonathan E. Green
- Eli Lilly & Co., Lilly Corporate Center, Indianapolis, Indiana 46285, and Department of Chemistry and Chemical Biology, Indiana University Purdue University Indianapolis, 402 N. Blackford St., Indianapolis, Indiana 46202
| | - David M. Bender
- Eli Lilly & Co., Lilly Corporate Center, Indianapolis, Indiana 46285, and Department of Chemistry and Chemical Biology, Indiana University Purdue University Indianapolis, 402 N. Blackford St., Indianapolis, Indiana 46202
| | - Stona Jackson
- Eli Lilly & Co., Lilly Corporate Center, Indianapolis, Indiana 46285, and Department of Chemistry and Chemical Biology, Indiana University Purdue University Indianapolis, 402 N. Blackford St., Indianapolis, Indiana 46202
| | - Martin J. O’Donnell
- Eli Lilly & Co., Lilly Corporate Center, Indianapolis, Indiana 46285, and Department of Chemistry and Chemical Biology, Indiana University Purdue University Indianapolis, 402 N. Blackford St., Indianapolis, Indiana 46202
| | - James R. McCarthy
- Eli Lilly & Co., Lilly Corporate Center, Indianapolis, Indiana 46285, and Department of Chemistry and Chemical Biology, Indiana University Purdue University Indianapolis, 402 N. Blackford St., Indianapolis, Indiana 46202
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47
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Aydillo C, Avenoza A, Busto JH, Jiménez-Osés G, Peregrina JM, Zurbano MM. α-Alkylation versus retro-O-Michael/γ-alkylation of bicyclic N,O-acetals: an entry to α-methylthreonine. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2008.11.031] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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48
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Zhao L, Li CJ. Functionalizing Glycine Derivatives by Direct CC Bond Formation. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200801367] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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49
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Zhao L, Li CJ. Functionalizing Glycine Derivatives by Direct CC Bond Formation. Angew Chem Int Ed Engl 2008; 47:7075-8. [DOI: 10.1002/anie.200801367] [Citation(s) in RCA: 293] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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50
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Fu P, Snapper ML, Hoveyda AH. Catalytic Asymmetric Alkylations of Ketoimines. Enantioselective Synthesis of N-Substituted Quaternary Carbon Stereogenic Centers by Zr-Catalyzed Additions of Dialkylzinc Reagents to Aryl-, Alkyl-, and Trifluoroalkyl-Substituted Ketoimines. J Am Chem Soc 2008; 130:5530-41. [DOI: 10.1021/ja8001343] [Citation(s) in RCA: 167] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Peng Fu
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467
| | - Marc L. Snapper
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467
| | - Amir H. Hoveyda
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467
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