Construction of the 1,2-Dialkenylcyclohexane Framework via Ireland-Claisen Rearrangement and Intramolecular Barbier Reaction: Application to the Synthesis of (±)-Geijerone and a Diastereoisomeric Mixture with Its 5-Epimer
作者:Dawei Liang、Nana Gao、Wei Liu、Jinhua Dong
DOI:10.3390/molecules19011238
日期:——
The elemene-type terpenoids, which possess various biological activities, contain a syn- or anti-1,2-dialkenylcyclohexane framework. An efficient synthetic route to the syn- and anti-1,2-dialkenylcyclohexane core and its application in the synthesis of (±)-geijerone and its diastereomer is reported. Construction of the syn- and anti-1,2-dialkenyl moiety was achieved via Ireland-Claisen rearrangement of the (E)-allylic ester, and the cyclohexanone moiety was derived from the iodoaldehyde via intramolecular Barbier reaction. The synthetic strategy allows rapid access to various epimers and analogues of elemene-type products.
元素型萜类化合物具有多种生物活性,包含一个顺式或反式的1,2-双烯基环己烷框架。本文报告了一种高效的合成路线,用于合成顺式和反式1,2-双烯基环己烷核心及其在合成(±)-盖杰酮及其二构型异构体中的应用。顺式和反式1,2-双烯基基团的构建是通过(E)-烯丙酯的艾尔兰德-克劳森重排实现的,而环己酮基团则是通过内分子巴比尔反应从碘醛衍生的。这一合成策略能够快速获得多种元素型产品的表异构体和类似物。