E-2-(Phenylsulfonyl)vinyl ethers of 2,3-epoxyalcohols are stereospecifically rearranged to 3-(phenylsulfony])-4-(1-hydroxyalkyl)-4,5-dihydrofurans on treatment with LDA. Oxidation of these compounds or the derived des-sulfonyl compounds provides esters or lactones which correspond to regiospecific delivery of -CO2H or -CH2CO2H to C-2, with inversion.
在用
LDA处理后,将2,3-环氧醇的E-2-(苯磺酰基)
乙烯基醚立体有择地重排为3-(苯磺酰基)-4-(1-羟烷基)-4,5-二氢
呋喃。这些化合物或衍生的去磺酰基化合物的氧化提供了酯或内酯,其对应于-CO 2 H或-CH 2 CO 2 H向C-2的区域特异性递送,并具有转化作用。