Nickel(0)‐Catalyzed Hydrocyanation of Terminal Allenes: A Regio‐ and Enantioselective Approach to Branched Allylic Nitriles
作者:Timm Bury、Sven Kullmann、Bernhard Breit
DOI:10.1002/adsc.202201189
日期:2023.2.7
A highly branched regioselective nickel(0)-catalyzed hydrocyanation of mono- and 1,1-disubstituted allenes as well as an asymmetric hydrocyanation of 1,1-disubstituted allenes are reported herein, giving access to branched tertiary and quaternary β,γ-allylic nitriles. For the regioselective hydrocyanation of terminal allenes, a nickel(0)/Biphephos catalytic system applicable to a substrate scope containing
本文报道了高度支化的区域选择性镍 (0) 催化的单取代和 1,1-二取代丙二烯的氢氰化以及 1,1-二取代丙二烯的不对称氢氰化,从而获得支化的叔和季 β,γ-烯丙基腈类。对于末端丙二烯的区域选择性氢氰化,镍 (0)/Biphephos 催化体系适用于包含酯、THP 基团、伯脂肪族碘化物和游离羧酸等官能团的底物范围,提供高达 96% 的产率。通过将基于 Ni(0)/TADDOL 的双亚磷酸酯催化剂应用于 1,1-二取代丙二烯的催化体系,支链季烯丙基腈的收率高达 99%,对映选择性高达 86%。这两种协议都利用了可管理的 HCN 源并证明了良好的原子经济性。此外,