申请人:Massachusetts Institute of Technology
公开号:US05162554A1
公开(公告)日:1992-11-10
Stable, optically active enantiomers of substituted glyceraldehydes or glycidaldehydes are synthesized by using osmium-catalyzed asymmetric dihydroxylation of an olefin which is a substituted 1,5-dihydro-3H-2,4-benzodioxepine. For example, the protected glyceraldehyde, 3-(1,2-dihydroxyethyl)-1,5-dihydro-3H-2,4-benzodioxepine and the protected glycidaldehyde, 3-(1,2-epoxyethyl)-1,5-dihydro-3H-2,4-benzodioxepine have been synthesized and the optical enantiomer has been recovered. In the synthetic and isolation methods, enantiomers with high enantiomeric excess are recovered from the mother liquor following a recrystallization step.
使用奥斯米姆催化不对称二羟基化合成了取代甘油醛或甘氧醛的稳定、光学活性对映体,该催化反应的底物是取代的1,5-二氢-3H-2,4-苯并二氧杂环戊烯。例如,合成了保护的甘油醛,3-(1,2-二羟乙基)-1,5-二氢-3H-2,4-苯并二氧杂环戊烯和保护的甘氧醛,3-(1,2-环氧乙基)-1,5-二氢-3H-2,4-苯并二氧杂环戊烯,并回收了光学对映体。在合成和分离方法中,通过重新结晶步骤从母液中回收高对映体过量的对映体。