Synthesis of 1,5-Bifunctionalized Optically Active 3-Pentanol as a Reversible Chiral Building Block. Asymmetric Reduction of 4-(1,3-Dithian-2-yl)-3-oxobutanoates with Fermenting Bakers’ Yeast
作者:Hidenori Chikashita、Kazuhiko Ohkawa、Kazuyoshi Itoh
DOI:10.1246/bcsj.62.3513
日期:1989.11
Bakers’ yeast reduction of a homologous series of 4-(1,3-dithian-2-yl)-3-oxobutanoates to the corresponding chiral 4-(1,3-dithian-2-yl)-3-hydroxybutanoates was investigated. A shift in enantiomeric excess, stereochemistry, and chemical yield of the reduction product was observed as the size of the ester alkoxyl group was changed. The kind of bakers’ yeast (raw or dry) and reaction conditions also affected
面包师酵母将同源系列的 4-(1,3-dithian-2-yl)-3-oxobutanoates 还原为相应的手性 4-(1,3-dithian-2-yl)-3-hydroxybutanoates 进行了研究。随着酯烷氧基的大小改变,观察到还原产物的对映体过量、立体化学和化学产率发生变化。面包酵母的种类(生的或干的)和反应条件也会影响产品的光学纯度和化学产率。这些研究表明,在没有添加剂的情况下,用生酵母还原 4-(1,3-dithian-2-yl)-3-oxobutanoate 是最有效的,得到 (S)-4-(1,3 -dithian-2-yl)-3-羟基丁酸酯,具有 77% ee,产率 37%。