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
Bismuth trichloride as a new efficient catalyst in the aldol reaction
作者:Hidenori Ohki、Makoto Wada、Kin-ya Akiba
DOI:10.1016/s0040-4039(00)80590-0
日期:——
In the presence of a catalytic amount of bismuthtrichloride (5 mol%), silyl enol ethers react with aldehydes at room temperature to give the corresponding aldols in good yields.