✦ LIBER ✦

On the preparation of substituted 4H- 1,3,4-thiadiazolo[2,3-c]-1,2,4-triazin-4-ones and 1,2,4-triazolo[3,4-b]-1,3,4-thiadiazoles

✍ Scribed by Frank T. Coppo; Maged M. Fawzi

Publisher: Journal of Heterocyclic Chemistry
Year: 1997
Tongue: English
Weight: 231 KB
Volume: 34
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570340443

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✦ Synopsis

Abstract

The reaction of benzoyl isothiocyanates and methoxycarbonyl isothiocyanate with 4‐amino‐4,5‐dihydro‐3‐(methylthio)‐1,2,4‐triazin‐5‐ones in acetonitrile gave several substituted 4__H__‐1,3,4‐thiadiazolo[2,3‐c]‐1,2,4‐triazin‐4‐ones VIa‐h instead of the expected thioureas. In addition, benzoyl isothiocyanate reacted with 4‐amino‐3‐(methylthio)‐5‐(trifluoromethyl)‐4__H__‐1,2,4‐triazole to give the benzoyl thiourea IX and with 4‐amino‐3‐mercapto‐5‐(trifluoromethyl)‐4__H__‐1,2,4‐triazole to give the bicyclic compound N‐[3‐(trifluoromethyl)‐1,2,4‐triazolo[3,4‐b]‐1,3,4‐thiadiazol‐6‐yl]benzamide IX.

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