Intramolecular nitrile oxide cycloaddition on chiral olefins: a stereocontrolled approach to β-ketol precursors
作者:Rita Annunziata、Mauro Cinquini、Franco Cozzi、Giulio Dondio、Laura Raimondi
DOI:10.1016/s0040-4020(01)86823-x
日期:——
The intramolecular nitrile oxide cycloaddition reaction on chiral (E) and (Z) olefins featuring a sulphur atom along the carbon chain connecting dipole and dipolarophile occurs with poor to excellent anti stereoselectivity, which is mainly affected by the substitutents at the allylic stereocenter. The possibility of converting the cycloadducts into stereoisomerically pure β-ketols has been established
沿连接偶极子和亲偶极子的碳链上具有硫原子的手性(E)和(Z)烯烃的分子内腈氧化物环加成反应发生时,其抗立体选择性差到极佳,这主要受烯丙基立体中心的取代基影响。在一种情况下,已经确定了将环加合物转化为立体异构纯的β-酮醇的可能性。