One-Pot Organocatalytic Enantioselective Michael–Michael–Aldol–Henry Reaction Cascade. A Facile Entry to the Steroid System with Six Contiguous Stereogenic Centers
作者:Dai-Huei Jhuo、Bor-Cherng Hong、Chun-Wei Chang、Gene-Hsiang Lee
DOI:10.1021/ol501011t
日期:2014.5.16
An expedited method has been developed for the enantioselective synthesis of highly functionalized steroid systems containing six contiguous stereogenic centers with high enantioselectivities (99% ee). The one-pot methodology comprises a cascade of organocatalytic Michael–Michael–aldol–Henry reactions of 7-nitrohept-3-en-2-one and 5-(1-methyl-2,5-dioxocyclopentyl)pent-2-enal. The structure and absolute
已开发出一种快速方法,用于对高度功能化的类固醇系统的对映选择性合成,该系统包含六个具有高对映选择性(99%ee)的连续立体发生中心。一锅法包括7-硝基庚-3-烯-2-酮和5-(1-甲基-2,5-二氧代环戊基)戊-2-烯醛的有机催化Michael–Michael–aldol–Henry反应级联。通过适当产品的X射线分析确认了产品的结构和绝对构型。