Metal‐Free Synthesis of Alkenylazaarenes and 2‐Aminoquinolines through Base‐Mediated Aerobic Oxidative Dehydrogenation of Benzyl Alcohols
作者:Dipak J. Dahatonde、Aritra Ghosh、Sanjay Batra
DOI:10.1002/ejoc.202100420
日期:2021.5.20
A metal‐free, base‐mediated oxidative dehydrogenative coupling of substituted phenylmethanols (benzyl alcohols) with methyl azaarenes or phenylacetonitriles to afford substituted alkenylazaarenes or 2‐aminoquinolines, respectively is presented.
A practical and sustainable synthesis of substituted quinolines was achieved through the annulation of 2‐aminobenzyl alcohol with various secondary alcohols, ketones, aldehydes, or nitriles, under hydrogen‐borrowing conditions. Under the catalysis of well‐defined rhenium complexes bearing tridentate diphosphinoamino ligands, the reaction proceeded efficiently (31 examples were isolated with yields