Synthesis of several mesoionic 1,3,4-thiadiazoles
β Scribed by Thomas G. Stewart; Lemont B. Kier
- Publisher
- John Wiley and Sons
- Year
- 1965
- Tongue
- English
- Weight
- 284 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0022-3549
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π SIMILAR VOLUMES
Two general methods are reported for the preparation of 1,2,4-triazolo[3,4-b][1,2,4]thiadiazolium salts 4 from 4-amino-2,4-dihydro-2-methyl-5-(methylthio)-3H-1,2,4-triazol-3thione (1). The first one involves the initial formation of arylidene derivatives 2 which undergo cyclization by the action of
Reaction of 4H-3.1-benzothiazine-4-lhiones 1 with S-methylisothiosemicarbazide hydroiodide yields bamino-1.3.4-thiadiazoles 2 insteud of the espected 1.2,4-triazolo[3,2-c]quinazolines. Structures of compounds 2 have been established by mcans of '>C-N M R analysis and X-ray crystallography. 3-Arnino-
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