作者:W.Russell Bowman、Colin F Bridge、Philip Brookes
DOI:10.1016/s0040-4039(00)01596-3
日期:2000.11
Iminyl radicals, generated by 5-exo cyclisation of alkyl, vinyl and aryl C-centred radicals onto nitriles, undergo β-scission (nitrile translocation), reduction or tandem cyclisation onto alkenes depending on the nature of the α-substituent. 5-exo Cyclisations of aryl radicals onto nitriles undergo nitrile translocation when the α-substituent is CN, CO2R, SO2Ph or CONMe2. The rate of translocation
通过将烷基,乙烯基和芳基C中心的自由基进行5 exo环化到腈上而生成的亚氨基自由基,根据α取代基的性质,经历β断裂(腈移位),还原或串联环化到烯烃上。当α-取代基为CN,CO 2 R,SO 2 Ph或CONMe 2时,芳基在腈上的5- exo环化经历腈移位。易位的速率快于5-或6- exo环化到烯烃上或烯丙基氢的1,5-氢提取上。当α-取代基为烷基时,中间体亚氨基不经历腈移位。