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1,2,4-Triazoles. Improved synthesis of 5-substituted 4-amino-3-mer-cato-(4H)-1,2,4-triazoles and a facile route to 3,6-disubstituted 1,2,4-triazolo[3,4-b][1,3,4]thiadiazoles

✍ Scribed by Francesco Paolo Invidiata; Giancarlo Furná; Ilaria Lampronti; Daniele Simoni

Publisher: Journal of Heterocyclic Chemistry
Year: 1997
Tongue: English
Weight: 243 KB
Volume: 34
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570340427

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✦ Synopsis

Abstract

The reaction of thiocarbohydrazide with carboxylic acids at the melting temperature allows an improved preparation of the S‐substituted 4‐amino‐3‐mercapto‐1,2,4‐triazole heterocycles. The crude 4‐amino‐5‐mercapto‐1,2,4‐triazoles react easily with carboxylic acids or carboxylic acid chlorides to afford the 1,2,4‐triazolo[3,4‐fc][1,3,4]thiadiazole ring system.

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