Nickel-Catalyzed Direct Synthesis of <i>N</i>-Substituted Indoles from Amino Alcohols and Alcohols
作者:Vinita Yadav、Sayali G. Jagtap、Ekambaram Balaraman、Santosh B. Mhaske
DOI:10.1021/acs.orglett.2c03617
日期:2022.12.16
primary alcohols, cyclic and acyclic secondary alcohols, and various substituted 2-aminophenyl ethyl alcohols are employed in the reaction conditions to provide a diverse range of N-alkylated indoles. Mechanistic studies revealed that the reaction proceeds through tandem N-alkylation via hydrogen autotransfer followed by the cyclization of N-alkylated alcohol intermediate.
报道了在无添加剂和无碱条件下从氨基醇和醇合成N-取代吲哚的单锅级联方法,释放的水是唯一的化学计量副产物。市售的稳定型 Ni(OTf) 2盐与 1,2-双(二环己基膦基)乙烷 (dcype) 相结合,对于这种前所未有的催化转化非常有效。在反应条件下使用范围广泛的底物,包括芳香族和脂肪族伯醇、环状和非环状仲醇以及各种取代的 2-氨基苯基乙醇,以提供各种N-烷基化吲哚。机理研究表明,反应通过串联N-通过氢自动转移进行烷基化,然后是N-烷基化醇中间体的环化。