Oxidation of γ-butenolides was effected by KMnO4-crown ether to afford the corresponding 2,3-cis-dihydroxy-γ-butyrolactones in high yields. High stereoselectivity was observed in cases when bulky substituents were introduced at the γ-position of the butenolides.
γ-
丁烯醇的氧化作用由KMnO4-
冠醚实现,以高产量提供相应的2,3-顺式-二羟基-
γ-丁内酯。当在
丁烯醇的γ位引入大体积的取代基时,观察到高立体选择性。