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.