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 conjugate addition of organoaluminum reagents (Me3Al, Et3Al and Et2AlCN) to substrates 3 and 4. Whereas the conjugate addition to Michael acceptors 3 occurs with complete syn-selectivity, the conjugate addition to butenolides 4 is usually anti-selective. This methodology has been applied
描述了从容易获得的α-(苯磺酰基)-α,β-不饱和酯3或α-(苯磺酰基)丁烯化物4开始制备顺式和反式双取代(和三取代)γ-内酯的立体选择路线。该方法基于将有机铝试剂(Me 3 Al,Et 3 Al和Et 2 AlCN)共轭添加到基质3和4上。尽管共轭加成到迈克尔受体3时具有完全的同选择性,而共轭加成成丁烯脂类4通常是反选择的。该方法已经应用于(-)-顺式白兰地内酯的立体选择性和对映选择性合成。