Asymmetric synthesis of N-protected syn and anti (E)-3-amino-2-hydroxy-4-hexenoate: A practical method for the C-α epimerization of anti β-amino-α-hydroxy acids
作者:Ian Brackenridge、Stephen G Davies、David R Fenwick、Osamu Ichihara、Mario E.C Polywka
DOI:10.1016/s0040-4020(98)01051-5
日期:1999.1
corresponding syn esters via the DCC/DMAP·HCl mediated esterification was devised, and methyl (2R,3S)-(E)-3-t-butoxycarbonylamino-2-hydroxy-4-hexenoate 15 was synthesised from the corresponding (2S,3S)-isomer9 using the epimerization procedure developed. The α- and β-stereogenic centres of 9 were constructed by the Michael addition of a homochiral lithium amide to t-butyl sorbate and subsequent oxidation of the
提出了一种通过DCC / DMAP·HCl介导的酯化反应将抗β-氨基-α-羟基酸转化为相应的合成酯的实用方法,并合成了甲基(2 R,3 S)-(E)-3-叔丁氧羰基氨基使用开发的差向异构化方法,由相应的(2 S,3 S)-异构体9合成-2-羟基-4-己烯酸酯15。的α-和β-立体中心9是由Michael加成的纯手性氨基化锂,以构建吨一锅中山梨酸丁酯和烯醇盐中间体的随后氧化。