Facile one pot synthesis of N-fused 1,2,4-triazoles via oxidative cyclisation using DDQ

Abstract

A facile and expedient one pot synthesis of N-fused 1,2,4-triazoles from 2-hydrazinopyridines or 2-hydrazinopyrazines and aldehydes is described via oxidative cyclization using DDQ as a safe and convenient oxidizing agent and polyethylene glycol as recyclable reaction medium. This protocol is effective toward various substrates having different functionalities. The easy recyclability of the reaction medium makes the process economic and potentially viable for commercial applications.