Stereospecific Reaction of α-Carbamoyloxy-2-alkenylboronates and α-Carbamoyloxy-alkylboronates with Grignard Reagents - Synthesis of Highly Enantioenriched Secondary Alcohols
Boryl-Dictated Site-Selective Intermolecular Allylic and Propargylic C–H Amination
作者:Yuan Liu、Zhi-Hao Chen、Yin Li、Jiasheng Qian、Qingjiang Li、Honggen Wang
DOI:10.1021/jacs.2c06117
日期:2022.8.10
double and triple bonds within the productleave room for further decorations. Mechanistic studies reveal that the key stabilization effect of the B(MIDA) moiety on its adjacent developing positive charge is responsible for the high site-selectivity and that a closed transition state might be involved, as the reaction is fully stereoretentive. An activation effect of B(MIDA) is also found.
textbook-taught reaction, yet it is not always possible to control the regioselectivity of addition to unsymmetrical 1,2-disubstituted substrates. We report the observation and applications of the β-boron effect that accounts for high regioselectivity in electrophilic addition reactions to allylic MIDA (N-methyliminodiacetic acid) boronates. While the well-established β-silicon effect bears partial resemblance