Stereoselective synthesis of substituted γ-butyrolactones from γ-hydroxy-α,β-unsaturated phenyl sulfones
作者:Javier Rojo、Mercedes García、Juan C Carretero
DOI:10.1016/s0040-4020(01)80181-2
日期:1993.1
α-(phenylsulfonyl)-α,β-unsaturated esters 3 or α-(phenylsulfonyl)butenolides 4 is described. This method is based on the conjugateaddition of organoaluminum reagents (Me3Al, Et3Al and Et2AlCN) to substrates 3 and 4. Whereas the conjugateaddition to Michael acceptors 3 occurs with complete syn-selectivity, the conjugateaddition to butenolides 4 is usually anti-selective. This methodology has been applied