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
Dual-Stereocontrol Asymmetric Cobalt-Catalyzed Hydroboration of Sterically Hindered Styrenes
作者:Heyi Zhang、Zhan Lu
DOI:10.1021/acscatal.6b02278
日期:2016.10.7
An oxazoline aminoisopropylpyridine (OAP) was designed and synthesized for cobalt-catalyzed asymmetric hydroboration of stericallyhindered styrenes. A unique dual-stereocontrol phenomenon was observed using a rigid OIP·CoCl2 complex or a flexible OAP with CoCl2 as precatalysts, respectively. The reaction could be easily carried out on a gram scale to afford chiral alkylboronic esters which could be