γ-Lactone-Tethered Ring-Closing Metathesis. A Route to Enantiomerically Enriched γ-Lactones α,β-Fused to Medium-Sized Rings
作者:Carmen M. Rodríguez、José Luis Ravelo、Víctor S. Martín
DOI:10.1021/ol0478739
日期:2004.12.1
[reaction: see text] The stereoselective alkylation of alpha-(phenylsulfonyl)-beta-[(methoxycarbonyl)methyl]-gamma-lactones obtained by the base-induced cyclization of enantiomerically enriched alpha-[(phenylthio)acyl]-alpha,beta-unsaturated esters and ring-closing olefin metathesis (RCM) are the basis of a new approach for gaining access to gamma-lactones that are alpha,beta-fused to medium-sized
[反应:见正文]通过对映异构体富集的α-[(苯硫基)酰基]-α,β的碱诱导环化获得的α-(苯磺酰基)-β-[(甲氧羰基)甲基]-γ-内酯的立体选择性烷基化-不饱和酯和闭环烯烃复分解(RCM)是获得α,β融合至中型碳环和环醚的γ-内酯的新方法的基础。