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Report | Regular issue | Vol 23, No. 9, 1985, pp.2357-2362
Published online, 1st January, 1970
DOI: 10.3987/R-1985-09-2357
Reaction of 4-Thioxo-1,3-benzothiazines with Amidrazones: Synthesis of 1,2,4-Triazolo[1,5-c]quinazoline Derivatives

Pedro Molina,* Antonio Arques, Inmaculada Cartagena, and Maris Victoria Valcarcel

*Departmento de Química Orgánica, Facultad de Ciencias, Universidad de Murcia, 30071 Murcia, Spain


4-Aryl-4-thioxo-1,3-benzothiazines react with unsubstituted amidrazones to give the corresponding amidinoquinazolinthiones which by action of methyl iodide cyclize to 2,5-diaryl-1,2,4-triazolo[1,5-c]quinazolines. Reaction of amidinoquinazolinthiones with hydrochloric acid leads to 2,5-diarylthiadiazoles.