Stereoselective Preparationof Functionalized Unsaturated Lactones and Esters via FunctionalizedMagnesium Carbenoids
作者:Paul Knochel、Viet Anh Vu、Ilan Marek
DOI:10.1055/s-2003-41035
日期:——
The reaction of β,β-dibromo or diiodo unsaturatedesters with i-PrMgCl (1 equivalent) indiethyl ether allows the generation of functionalized alkenylmagnesiumcarbenoids which react with retention of configuration with variouselectrophiles providing polyfunctionalized unsaturated esters andlactones. By using two equivalents of i-PrMgCl,a 1,2-migration with retention of configuration occurs in diethylether allowing a new synthesis of tetrasubstituted esters and lactones.
在二乙醚中,β,β-二溴或二碘不饱和酯与i-PrMgCl(1当量)反应,可以生成官能化的烯基镁卡宾,这些卡宾以构型保留的方式与各种亲电试剂反应,生成多官能化的不饱和酯和内酯。通过使用两当量的i-PrMgCl,在二乙醚中会发生构型保留的1,2-迁移,从而实现新型四取代酯和内酯的合成。