Asymmetric sharpless epoxidation of divinylcarbinol. Erythro-D- and -L-4-pentenitols by hydrolysis of regioisomeric epoxy-4-pentenols
作者:Volker Jäger、Detlef Schröter、Bernhard Koppenhoefer
DOI:10.1016/s0040-4020(01)96130-7
日期:——
The asymmetric Sharpless epoxidation of divinylcarbinol (1), a secondary, achiral allylic alcohol, is described in detail. The epoxidation proceeds with high enantio-control and diastereo-selection. The resulting 1,2-epoxy-4-pentene-3-ols 2 are equilibrated to afford the internal epoxides 5. Hydrolysis of the regioisomers 2 and 5, respectively, furnishes opposite enantiomers of erythro-4-pentenitols
详细描述了仲乙烯基非手性烯丙醇二乙烯基甲醇(1)的不对称Sharpless环氧化反应。环氧化以高对映体控制和非对映选择进行。使所得的1,2-环氧-4-戊烯-3-醇2平衡以提供内部环氧化物5。区域异构体2和5的水解分别以高选择性提供了赤型-4-戊烯醇3的相反对映异构体。描述了3的几种衍生物,以及较少的立体选择性路线的结果-来自D-甘油醛丙酮化物(10)-提供了苏氨酸的NMR数据系列。-报告了二乙烯基甲醇(1)的急性毒性,以及通过Ames试验确定的1,L- 2和L- 5的致突变性。