Simple, versatile and highly diastereoselective synthesis of 1,3,4-trisubstituted-2-oxopiperazine-containing peptidomimetic precursors
作者:Nicolas Franceschini、Pascal Sonnet、Dominique Guillaume
DOI:10.1039/b416162a
日期:——
O-deprotection of (1'S)-4-(tert-butoxycarbonyl)-1-[1'-phenylmethyloxymethyl-2'-[(tert-butyldimethyl silyl)oxy]ethyl]-2-oxopiperazine furnished an enantiomerically pure alcohol whose regio- and diastereoselective C3-alkylation yielded either (3R)- or (3S)-1,3,4-trisubstituted-2-oxopiperazines in high diastereomeric purity. These derivatives were efficiently transformed into (1'R)- or (1'S)-peptide templates
(1'S)-4-(叔丁氧基羰基)-1- [1'-苯基甲氧基甲基-2'-[(叔丁基二甲基甲硅烷基)氧基]乙基] -2-氧哌嗪的选择性O-脱保护提供了对映体纯的醇,其区域和非对映选择性C3-烷基化以高非对映异构纯度产生(3R)-或(3S)-1,3,4-三取代-2-氧哌嗪。这些衍生物被有效地转化为可用于制备拟肽的(1'R)-或(1'S)-肽模板。该方法可轻松获得每个1,3,4-三取代-2-氧杂哌嗪非对映异构体,并通过在3位上选择的大量取代基以及可在N1取代基上进行的化学反应,促进了来自单个前体的大量非对映体纯约束肽模拟物。