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Wang Y, Han L, Yuan N, Wang H, Li H, Liu J, Chen H, Zhang Q, Dong S. Traceless β-mercaptan-assisted activation of valinyl benzimidazolinones in peptide ligations. Chem Sci 2018; 9:1940-1946. [PMID: 29675240 PMCID: PMC5892131 DOI: 10.1039/c7sc04148a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 01/04/2018] [Indexed: 12/27/2022] Open
Abstract
Peptidyl thioesters or their surrogates with C-terminal β-branched hydrophobic amino acid residues usually exhibit poor reactivities in ligation reactions. Thus, activation using exogenous additives is required to ensure an acceptable reaction efficiency. Herein, we report a traceless ligation at Val-Xaa sites under mild thiol additive-free reaction conditions, whereby the introduction of β-mercaptan on the C-terminal valine residue effectively activates the otherwise unreactive N-acyl-benzimidazolinone (Nbz), and enables the use of a one-pot ligation-desulfurization strategy to generate the desired peptide products. The orthogonality between β-thiovaline-Nbz and a conventional alkyl thioester, as well as the convenient access to the former from readily available penicillamine, also allowed expedited assembly of the peptidic hormone β-LPH and hPTH analogues, based on a kinetically controlled one-pot three-segment ligation and desulfurization strategy.
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Affiliation(s)
- Yinglu Wang
- State Key Laboratory of Natural and Biomimetic Drugs , Department of Chemical Biology , School of Pharmaceutical Sciences , Peking University , Beijing 100191 , China .
| | - Lin Han
- State Key Laboratory of Natural and Biomimetic Drugs , Department of Chemical Biology , School of Pharmaceutical Sciences , Peking University , Beijing 100191 , China .
| | - Ning Yuan
- State Key Laboratory of Natural and Biomimetic Drugs , Department of Chemical Biology , School of Pharmaceutical Sciences , Peking University , Beijing 100191 , China .
| | - Hanxuan Wang
- State Key Laboratory of Natural and Biomimetic Drugs , Department of Chemical Biology , School of Pharmaceutical Sciences , Peking University , Beijing 100191 , China .
| | - Hongxing Li
- State Key Laboratory of Natural and Biomimetic Drugs , Department of Chemical Biology , School of Pharmaceutical Sciences , Peking University , Beijing 100191 , China .
| | - Jinrong Liu
- State Key Laboratory of Natural and Biomimetic Drugs , Department of Chemical Biology , School of Pharmaceutical Sciences , Peking University , Beijing 100191 , China .
| | - Huan Chen
- Department of Chemistry , University at Albany , Albany , New York 12222 , USA .
| | - Qiang Zhang
- Department of Chemistry , University at Albany , Albany , New York 12222 , USA .
| | - Suwei Dong
- State Key Laboratory of Natural and Biomimetic Drugs , Department of Chemical Biology , School of Pharmaceutical Sciences , Peking University , Beijing 100191 , China .
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Chen H, Xiao Y, Yuan N, Weng J, Gao P, Breindel L, Shekhtman A, Zhang Q. Coupling of sterically demanding peptides by β-thiolactone-mediated native chemical ligation. Chem Sci 2018; 9:1982-1988. [PMID: 29675245 PMCID: PMC5892351 DOI: 10.1039/c7sc04744d] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 01/02/2018] [Indexed: 12/30/2022] Open
Abstract
The ligation of sterically demanding peptidyl sites such as those involving Val-Val and Val-Pro linkages has proven to be extremely challenging with conventional NCL methods that rely on exogenous thiol additives. Herein, we report an efficient β-thiolactone-mediated additive-free NCL protocol that enables the establishment of these connections in good yield. The rapid NCL was followed by in situ desulfurization. Reaction rates between β-thiolactones and conventional thioesters towards NCL were also investigated, and direct aminolysis was ruled out as a possible pathway. Finally, the potent cytotoxic cyclic-peptide axinastatin 1 has been prepared using the developed methodology.
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Affiliation(s)
- Huan Chen
- Department of Chemistry , University at Albany , State University of New York , 1400 Washington Avenue , Albany , NY 12222 , USA .
| | - Yunxian Xiao
- Department of Chemistry , University at Albany , State University of New York , 1400 Washington Avenue , Albany , NY 12222 , USA .
| | - Ning Yuan
- State Key Laboratory of Natural and Biomimetic Drugs , School of Pharmaceutical Sciences , Peking University , 38 Xueyuan Road , Beijing 100191 , China
| | - Jiaping Weng
- Department of Chemistry , University at Albany , State University of New York , 1400 Washington Avenue , Albany , NY 12222 , USA .
| | - Pengcheng Gao
- Department of Chemistry , University at Albany , State University of New York , 1400 Washington Avenue , Albany , NY 12222 , USA .
| | - Leonard Breindel
- Department of Chemistry , University at Albany , State University of New York , 1400 Washington Avenue , Albany , NY 12222 , USA
| | - Alexander Shekhtman
- Department of Chemistry , University at Albany , State University of New York , 1400 Washington Avenue , Albany , NY 12222 , USA
| | - Qiang Zhang
- Department of Chemistry , University at Albany , State University of New York , 1400 Washington Avenue , Albany , NY 12222 , USA .
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Noel A, Delpech B, Crich D. Chemistry of the β-thiolactones: substituent and solvent effects on thermal decomposition and comparison with the β-lactones. J Org Chem 2014; 79:4068-77. [PMID: 24716459 DOI: 10.1021/jo500577c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The synthesis of a series of di-, tri-, and tetraalkyl β-thiolactones and β-lactones is described as well as their thermal decomposition with extrusion of carbon oxysulfide and carbon dioxide in two solvents of opposite polarities. The β-thiolactones are considerably more thermally stable than the β-lactones and require higher temperatures for efficient decomposition in both solvents, whatever the degree of substitution. The results are interpreted in terms of a zwitterionic mechanism for fragmentation with a change in the rate-determining step between the two series.
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Affiliation(s)
- Amandine Noel
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS , Avenue de la Terrasse, 91190 Gif-sur-Yvette, France
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