An existing challenge is the development of efficient regioselective catalytic systems that are compatible with stable hydroboration reagents and can be rendered enantioselective by the use of nonracemic ligands. Copper(I) complexes with chelating phosphines catalyzed the regio‐ and enantioselective hydroboration of styrenes with pinacolborane (PinBH) at room temperature to afford the corresponding
Enantioselective Hydroboration of Styrenes with Markovnikov Selectivity Catalyzed by a Rhodium(I)-NHC Complex
作者:Kartick Dey、Zeqing Chen、Natalia Fridman、Graham de Ruiter
DOI:10.1021/acs.organomet.4c00002
日期:2024.4.22
developing field where N-heterocycliccarbenes (NHCs) are making increasingly more impact. Herein, we report the synthesis and characterization of carbene-oxazoline containing proligands that exhibit two chiral centers. The corresponding rhodium(I) complexes show excellent activity toward the asymmetric hydroboration of styrenes, which occurs with good regio– and enantioselectivity (up to 96% ee). The
Cobalt-Catalyzed Asymmetric Markovnikov Hydroboration of Styrenes
作者:Xu Chen、Zhaoyang Cheng、Zhan Lu
DOI:10.1021/acscatal.8b05135
日期:2019.5.3
A cobalt-catalyzed asymmetric hydroboration of styrenes using an imidazoline phenyl picoliamide (ImPPA) ligand was first reported to deliver the valuable chiral secondary organoboronates with good functional tolerance and highenantioselectivity (up to >99% ee). This protocol is operationally simple without any activator. Particularly, this method can be applied in the asymmetric hydroboration of allylamine