Synthesis and Desymmetrization of <i>meso</i> Tricyclic Systems Derived from Benzene Oxide
作者:Desirée M. Matías、Jeffrey S. Johnson
DOI:10.1021/acs.joc.8b00523
日期:2018.4.20
Ozonolysis of the Diels–Alder adducts derived from benzene oxides and N-alkylmaleimides resulted in fully substituted, meso bicyclic systems bearing six contiguous stereocenters, isolated as diols upon reductive workup with NaBH4. Variation in the workup allowed for isolation of two different diastereoisomers, through double epimerization of the imide stereocenters. Desymmetrization of the resulting
源自苯氧化物和N-烷基马来酰亚胺的Diels-Alder加合物的臭氧分解导致带有六个连续立体中心的完全取代的内消旋双环体系,经NaBH 4还原后分离为二醇。后处理的变化允许通过酰亚胺立体中心的双差向异构化来分离两种不同的非对映异构体。通过不对称的亲核环氧化物开环和酰化反应使所得的内消旋二醇不对称化,提供了进入高度取代的,对映体富集的稠合环的途径。