Asymmetric dihydroxylation of vinyl sulfones: routes to enantioenriched α-hydroxyaldehydes and the enantioselective syntheses of furan-2(5H)-ones
作者:Paul Evans、Mélanie Leffray
DOI:10.1016/j.tet.2003.08.003
日期:2003.9
dihydroxylation of α,β-unsaturated sulfones under Sharpless conditions affords enantioenriched α-hydroxyaldehydes in a complex mixture of dimeric species. These mixtures undergo olefination generating the corresponding α,β-unsaturated esters or furan-2(5H)-ones with high levels of enantiomeric excess. The application of this method for the rapid stereoselective synthesis of the furanone natural products; quercus
在Sharpless条件下,α,β-不饱和砜的不对称二羟基化可在二聚体物种的复杂混合物中提供对映体富集的α-羟醛。这些混合物进行烯烃化反应,生成相应的α,β-不饱和酯或呋喃-2(5 H)-具有高水平对映异构体过量的酯。该方法在呋喃酮天然产物的快速立体选择性合成中的应用;描述了栎内酯和马来酰亚胺。