Asymmetric Allylic Alkylation of β-Ketoesters via C–N Bond Cleavage of <i>N</i>-Allyl-<i>N</i>-methylaniline Derivatives Catalyzed by a Nickel–Diphosphine System
Haruki Nagae, Jingzhao Xia, Evgueni Kirillov, Kosuke Higashida, Koya Shoji, Valentin Boiteau, Wanbin Zhang, Jean‐François Carpentier, Kazushi Mashima
Abstract
Nickel complexes bearing chiral diphosphine ligands, such as (S)-Tol-MeO-BIPHEP and (S)-H8-BINAP, serve as efficient catalysts for asymmetric allylic alkylation (AAA) of β-ketoesters, using allylic amines as allyl sources. The reactions proceed with high catalytic activity and high enantioselectivity. N-Methyl-N-phenyl allylic amines were indispensable to achieve the high catalytic activity, to achieve the high enantioselectivity, and to expand the substrate scope to 5- and 7-membered β-ketoesters, whose nickel-catalyzed AAA with allylic alcohols results in low enantioselectivity. On the basis of the kinetics using a catalyst system made of Ni(cod)2 and (S)-Tol-MeO-BIPHEP, and DFT calculations for the reaction pathway of the AAA reaction mediated by an isolated olefin-coordinated nickel–DPPF complex 4b, we propose a mechanism where protonation of the nitrogen atom of the coordinating allylic amine by β-ketoester is key to cleaving the C–N bond and delivering a cationic π-allyl nickel(II) intermediate.