The rhodium(II)-catalyzed reaction of N-bis(trimethylsilylmethyl)diazoamides: steric, electronic and conformational effects
作者:Andrew G.H Wee、Sammy C Duncan
DOI:10.1016/s0040-4039(02)01273-x
日期:2002.8
insertion reaction occurs only at the other N-‘alkyl’ unit. In Cα-unbranched diazoamides, the inherent electronic effects of the N-‘alkyl’ group influence the regioselectivity of the reaction. The N-BTMSM group also influences the conformational preference about the amide N–Cα bond in Cα-branched systems which, in turn, affects the regioselectivity of the reaction; substituent electronic effects are subtle
所述Ñ双(三甲基甲硅烷基)甲基(Ñ -BTMSM)基团是有效的关于酰胺NC(O)在叔重氮酯键的构象控制; 金属碳氢化合物C–H插入反应仅在其他N-'烷基'单元发生。在C α -unbranched重氮酯,N型'alkyl”组的固有的电子效应会影响反应的区域选择性。该Ñ -BTMSM基也影响大约酰胺N-C构象偏好α在C键α -支化的系统,进而,影响反应的区域选择性; 取代基的电子效应是微妙的,并起着次要作用。提出了一个过渡状态模型来解释结果。