A Highly Stereoselective Divergent Synthesis of Bicyclic Models of Photoreactive Sesquiterpene Lactones
作者:Sébastien Fuchs、Valérie Berl、Jean-Pierre Lepoittevin
DOI:10.1002/ejoc.200600611
日期:2007.3
Sesquiterpene lactones are natural stereochemically pure compounds, which show a number of biological activities. In order to study the reactivity of sesquiterpene lactones in biological systems, we describe herein the asymmetric synthesis of a simple model, the α-methylene-hexahydrobenzofuranone 1, which includes the α-methylene-γ-butyrolactone moiety and presents all the different possible ring junctions
倍半萜内酯是天然立体化学纯化合物,具有多种生物活性。为了研究倍半萜内酯在生物系统中的反应性,我们在此描述了一个简单模型 α-亚甲基-六氢苯并呋喃酮 1 的不对称合成,该模型包括 α-亚甲基-γ-丁内酯部分并呈现所有不同的可能环路口。对映选择性是通过不对称钯催化的烯丙基取代获得的,非对映选择性是通过碘内酯化实现的。该策略提供了对映体过量 >98% 的不同内酯。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)