Heterocycles p. 1323 - 1332 (1987)
Update date:2022-07-29
Molina, Pedro
Argues, Antonio
Velasco, Maria de los Desamparados
Villalgordo, Jose Manuel
Two approaches for the preparation of a number of pyrazolo<5,1-b>thiazoles are reported.The first involves reaction of 3-amino-4-phenyl-thiazoline-2-thione 1 with phenacyl bromides to give thiazolo<2,3-b>-1,3,4-thiadiazines 2 which by action of triethylamine are converted into the pyrazolo<5,1-b>thiazoles 4.The second is based on the reaction of 3-amino-2-methylthio-4-phenylthiazolium cation 5 with activated acetonitriles to give 7-substituted 6-amino-3-phenylpyrazolo<5,1-b>thiazoles 7.
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