Radical-Based Asymmetric Synthesis: An Iterative Approach to 1, 3, 5, ... (2<i>n</i> + 1) Polyols
作者:Philip Garner、James T. Anderson
DOI:10.1021/ol990188v
日期:1999.10.1
[formula: see text] A conceptually novel approach to 1, 3, 5, ... (2n + 1) polyols based on iterative stereo-controlled homologation of chiral hydroxyalkyl radicals is reported. Starting from alpha-keto ester precursors, the general sequence of (1) ketone reduction, (2) auxiliary attachment, (3) saponification, (4) Barton esterification, and (5) radical addition provided the two-carbon homologue in
据报道,基于手性羟烷基基团的迭代立体控制同系物,对1、3、5,...(2n + 1)多元醇进行了概念上新颖的报道。从α-酮酸酯前体开始,一般的顺序是(1)酮还原,(2)辅助连接,(3)皂化,(4)Barton酯化和(5)自由基加成提供了70-总产率为80%。1,3,5,...(2n +1)多元醇合成的这种迭代策略的简单性和通用性为制备包含这种结构基序的分子提供了一种有吸引力的选择。