An improved procedure for the deamination of symmetrical 3,5-disubstituted 4-amino-1,2,4-triazoles
✍ Scribed by Fouad Bentiss; Michel Lagrenee; Hervéa Vezin; Marya Bouanis; Bouchaib Mernari
- Publisher
- Journal of Heterocyclic Chemistry
- Year
- 2002
- Tongue
- English
- Weight
- 51 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0022-152X
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✦ Synopsis
Abstract
A number of symmetrical 3,5‐disubstituted‐4__H__‐1,2,4‐triazoles have been synthesized in good yields by deamination of the corresponding 4‐amino‐1,2,4‐triazoles via reductive diazotation of these amino compounds in the presence of hypophosphorous acid. Analytical, spectral data and theoretical calculations confirmed the structures of the new triazole derivatives.
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## Abstract An improved synthesis for the preparation of 3‐oxo‐1,2,5‐thiadiazolidine 1,1‐dioxides has been developed. This facile two‐step procedure fromα‐amino acid esters and chlorosulfonyl isocyanate results in excellent yields of products.
## 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 chlo