Construction of Quaternary Carbon Center by Catalytic Asymmetric Alkylation of 3‐Arylpiperidin‐2‐ones Under Phase‐Transfer Conditions
作者:Tomoaki Inukai、Taichi Kano、Keiji Maruoka
DOI:10.1002/anie.201913518
日期:2020.2.3
A highly enantioselective synthesis of δ-lactams having a chiral quaternary carbon center at the α-position has been developed through an asymmetric alkylation of 3-arylpiperidin-2-ones underphase-transferconditions. In this transformation, a 2,2-diarylvinyl group on the δ-lactam nitrogen atom plays a crucial role as a novel protecting group and an achiral auxiliary for improving both yield and enantioselectivity
作者:Janine Cossy、Arnault de Filippis、Domingo Gomez Pardo
DOI:10.1055/s-2004-829193
日期:——
A very simple method for obtaining α-arylated N-protected 2-piperidinones in high yields is described. The use of ZnCl2, LiHMDS or s-BuLi as the base and Pd(dba)2 as the catalyst are the key factors.
Catalytic Asymmetric Allylic Alkylation of 3-Arylated Piperidin-2-ones
作者:Christophe Michon、Aurélien Béthegnies、Frédéric Capet、Pascal Roussel、Arnault de Filippis、Domingo Gomez-Pardo、Janine Cossy、Francine Agbossou-Niedercorn
DOI:10.1002/ejoc.201300510
日期:2013.8
The preparation of optically active lactams from 3-aryl-2-piperidinone is reported. The quaternary carbon stereocentres were formed using palladium-catalysed asymmetricallylicalkylation reactions. The resulting enantioenriched compounds are useful intermediates for the synthesis and development of neurokinin antagonists.