Catalyst-Directed Chemoselective Double Amination of Bromo-chloro(hetero)arenes: A Synthetic Route toward Advanced Amino-aniline Intermediates
作者:Alexandre A. Mikhailine、Gabriela A. Grasa Mannino、Thomas J. Colacot
DOI:10.1021/acs.orglett.8b00646
日期:2018.4.20
(APIs). Site (Cl vs Br on electrophile) and nucleophile (amine vs imine) selectivity is dictated by the catalyst employed. A Pd-crotyl(t-BuXPhos) precatalyst selectively coupled the Ar–Br of the polyhaloarene with benzophenone imine, even in the presence of a secondary amine, while Pd-based RuPhos or (BINAP)Pd(allyl)Cl coupled the Ar–Cl site with secondary amines.
开发了一种化学选择性顺序一锅偶联方案,以高产率制备几种氨基苯胺,作为活性药物成分(API)的组成部分。位点(亲电试剂上的Cl对Br)和亲核试剂(胺对亚胺)的选择性由所用催化剂决定。Pd-巴豆基(t - BuXPhos)预催化剂即使在存在仲胺的情况下也选择性地将聚卤代芳烃的Ar-Br与二苯甲酮亚胺偶联,而Pd基的RuPhos或(BINAP)Pd(烯丙基)Cl偶联Ar- Cl位带有仲胺。