Facile Construction of Optically Active 1,3-Diols. Synthesis of (2<i>S</i>,4<i>R</i>)-7-Octene-2,4-diol and<i>endo</i>-(1<i>S</i>,3<i>S</i>,5<i>R</i>)- and<i>exo</i>-(1<i>R</i>,3<i>S</i>,5<i>S</i>)-1,3-Dimethyl-2,9-dioxabicyclo[3.3.1]nonane
作者:Hidenori Chikashita、Eiji Kittaka、Yasunori Kimura、Kazuyoshi Itoh
DOI:10.1246/bcsj.62.833
日期:1989.3
A short and stereoselective asymmetric synthesis of (2S,4R)-7-octene-2,4-diol (a key intermediate in the Bartlett synthesis of nonactic acid) and two stereoisomers of a biologically active substance isolated from Norway spruce infested by ambrosia beetle, endo-(1S,3S,5R)- and exo-(1R,3S,5S)-1,3-dimethyl-2,9-dioxabicyclo-[3.3.1]nonane, was effectively accomplished in three and four reaction steps, respectively
(2S,4R)-7-octene-2,4-diol(非乳酸合成 Bartlett 中的关键中间体)和两种生物活性物质的立体异构体的立体选择性不对称合成,内-(1S,3S,5R)-和外-(1R,3S,5S)-1,3-二甲基-2,9-二氧杂双环-[3.3.1]壬烷,在三个和四个反应步骤中有效完成分别通过面包酵母不对称还原从容易获得的 (S)-1-(1,3-dithian-2-yl)-2-丙醇开始。主要策略是基于通过(S)-1-(1,3-二噻烷-2-基)-2-丙醇的二价阴离子与烷基卤化物的烷基化,轻松构建光学活性β-羟基酮,然后是它们的立体选择性还原。