Rapid, Traceless, AgI -Promoted Macrocyclization of Peptides Possessing an N-Terminal Thioamide.

Rapid, Traceless, AgI -Promoted Macrocyclization of Peptides Possessing an N-Terminal Thioamide.
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快速、无痕、AgI 促进具有 N 末端硫代酰胺的肽的大环化。

DOI:
10.1002/anie.201900243
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
C. Hutton
C. Hutton
中科院分区:
--
文献类型:
--
作者:
Varsha J. Thombare;C. Hutton

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肽大环化通常是一个缓慢的过程,受到差向异构化和环二聚化的困扰。在这里,我们描述了一种新的方法,肽大环化采用碘化银促进转化的肽硫代酰胺。AgI具有双重功能:化学选择性地激活硫代酰胺并将N-末端硫代酰胺连接到C-末端羧酸。Ag 2 S的挤出生成异酰亚胺中间体,其经历酰基转移以生成天然环肽,从而导致快速、无痕迹的大环化过程。在1小时内以高产率提供环肽,无差向异构化和环二聚化。
Peptide macrocyclization is often a slow process, plagued by epimerization and cyclodimerization. Herein, we describe a new method for peptide macrocyclization employing the AgI -promoted transformation of peptide thioamides. The AgI has a dual function: chemoselectively activating the thioamide and tethering the N-terminal thioamide to the C-terminal carboxylate. Extrusion of Ag2 S generates an isoimide intermediate, which undergoes acyl transfer to generate the native cyclic peptide, resulting in a rapid, traceless macrocylization process. Cyclic peptides are furnished in high yields within 1 hour, free of epimerization and cyclodimerization.
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