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 electroniceffects 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 electroniceffects are subtle
The Bis(trimethylsilyl)methyl Group as an Effective N-Protecting Group and Site-Selective Control Element in Rhodium(II)-Catalyzed Reaction of Diazoamides
作者:Andrew G. H. Wee、Sammy C. Duncan
DOI:10.1021/jo051042e
日期:2005.10.1
varied N-bis(trimethylsilyl)methyl,N-substituted diazoamides is studied. It has been found that in tertiary diazoamides the N-bis(trimethylsilyl)methyl (N-BTMSM) group is effective for conformational control about the amide N−C(O) bond; C−H insertion occurs at the other N-substituent. In Cα-branched diazoamides, the N-BTMSM is found also to exert its influence on the conformationalpreference about the