An efficient synthesis of 1,2-dihydroisoquinolines and -quinolines by employing dimethyl acetylenedicarboxylate activated isoquinolines and quinolines in conjuction with the CuCl2/Et3N catalytic system is described herein. Furthermore, the MoO3-catalysed alkynylation of pyridines and substituted pyridines has also been achieved. Moreover, this process has allowed the rapid synthesis of alkynyl derivatives
Metal‐ and Solvent‐Free, One‐Pot Synthesis of 3‐Unsubstituted Benzoindolizines
作者:Lukas Schifferer、Olga García Mancheño
DOI:10.1002/ejoc.202001245
日期:2020.12.13
A simple, one‐pot, metal‐free method for the synthesis of 3‐unsubstituted indolizines from readily available (iso)quinolines and propiolates is presented. Employing solvent‐free conditions, the competitive cyclization into 1,2‐disubstituted indolizines was suppressed, allowing remarkable chemoselectivity towards the synthetically valuable C1 mono‐substituted indolizines.