the reagent prepared from n-Bu3SnLi and Et2AlCl or from SnCl2 and Et2AlCl affords enolates which react with ketone or aldehyde to give β-hydroxy carbonyl compounds in good to excellent yields. The reactions proceed similarly with the reagents which are generated from R3PbLi (R=Ph, n-Bu) and Et2AlCl. Catalysis by the added Pd(PPh3)4 complex promotes the reduction effectively and improves the yields of
用由 n-Bu3SnLi 和 Et2AlCl 或由 SnCl2 和 Et2AlCl 制备的试剂处理 α-
溴羰基化合物,得到烯醇化物,该烯醇化物与酮或醛反应得到 β-羟基羰基化合物,收率良好至极好。反应与由 R3PbLi (R=Ph, n-Bu) 和 Et2AlCl 生成的试剂进行类似。添加的 Pd(PPh3)4 复合物的催化作用有效地促进了还原并提高了所需加合物的产率。公开了区域选择性和立体选择性。