Solid-Phase Synthesis and Structural Characterization of Highly Substituted Hydroxyproline-Based 2,5-Diketopiperazines
作者:Alberto Bianco、Carsten P. Sonksen、Peter Roepstorff、Jean-Paul Briand
DOI:10.1021/jo991818+
日期:2000.4.1
(Hyp) have been developed. An N-protected hydroxyproline methyl ester was linked through the hydroxyl function to the Ellman resin. The synthesis procedures were conceived to enable a sequence of Hyp alkylation, Hyp N-acylation, cyclization, and amide bond alkylation. Up to three different centers of molecular diversity were introduced around the DKP scaffold. Highly functionalized bicyclic compounds were
已经开发了两种用于合成含有反式-4-羟基-L-脯氨酸氨基酸残基(Hyp)的新型2,5-二酮哌嗪(DKP)的通用固相方法。N-保护的羟脯氨酸甲酯通过羟基官能团连接至Ellman树脂。设想合成程序以实现一系列的Hyp烷基化,Hyp N-酰化,环化和酰胺键烷基化。围绕DKP支架引入了多达三个不同的分子多样性中心。以良好的产率和纯度获得了高度官能化的双环化合物。进行羟脯氨酸αCH的烷基化而无需控制非对映选择性。在主链的最终烷基化过程中,观察到两个氨基酸残基的α-碳原子处的酰胺键差向异构。通过多维NMR实验阐明了代表性DKP的结构。所描述的反应途径可以用于鉴定针对多种酶靶的杂环分子抑制剂。