An Efficient Route to Ethyl 5‐Alkyl‐ (Aryl)‐1<i>H</i>‐1,2,4‐triazole‐3‐carboxylates

Abstract

An efficient general route to the synthesis of 5‐substituted 1 H ‐1,2,4‐triazole‐3‐carboxylates was developed. N ‐acylamidrazones were obtained from carboxylic acid hydrazides and ethyl thiooxamate or ethyl 2‐ethoxy‐2‐iminoacetate hydrochloride and then were reacted with chloroanhydride of the same carboxylic acid. As the next step, diacylamidrazones were cyclized to 5‐substituted 1 H ‐1,2,4‐triazole‐3‐carboxylates one pot in mild conditions.