Novel and Efficient Syntheses of Four Useful Shikimate-derived Epoxy Chiral Building Blocks via Cyclic Sulfite Intermediates
作者:Na Quan、Liangdeng Nie、Xiaoxin Shi、Ruiheng Zhu、Xia Lü
DOI:10.1002/cjoc.201201000
日期:2012.12
All of the four stereoisomers of methyl 4,5‐epoxy‐3‐hydroxy‐cyclohex‐1‐ene‐carboxylate (1a–1d) are useful chiral building blocks. Novel and efficient syntheses of these four epoxy chiral building blocks from naturally abundant (−)‐shikimic acid (2) via cyclic sulfite intermediates are described in this article. The targeted compound (3R,4R,5S)‐1a was synthesized via four steps from (−)‐shikimic acid
4,5-环氧-3-羟基-环己基-1-烯-羧酸甲酯(1a - 1d)的所有四个立体异构体都是有用的手性结构单元。本文介绍了通过环状亚硫酸盐中间体从自然丰富的(-)-草酸(2)合成这四种环氧手性结构单元的新颖有效的方法。目标化合物(3 R,4 R,5 S)-1a是由(-)-ki草酸分四步合成的,总收率为79%。其他三种目标化合物(3 S,4 R,5 S)-1b,(3 S,4 S,5 R) - 1C和(3 - [R,4小号,5 - [R )- 1D) - -莽草酸,56%分别为64%和65%总产率,分别通过从(七个步骤合成。