Abstract
4-Arylazo-3-phenyl-5-aminopyrazoles (5a,b) and substituted hydroxythiazoles8a,b were synthesized from the reaction of4a,b with hydrazine hydrate and mercaptoacetic acid respectively. Compounds5a,b and8a,b were also obtained from coupling of2a,b with6 and7, respectively. 4H-1,4-Benzothiazine11 was prepared from1 and10. The reaction of the diazonium salts2a-c with diethyl 3-amino-2-cyanopent-2-en-1,5-dicarboxylate12 was also reported.
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El-Taweel, F.M.AA., Mashaly, M.AH. & Elagamey, A.G.A. Activated nitriles in heterocyclic synthesis: Syntheses of thiazole, pyrazole and 4H-1,4-benzothiazine derivatives. Arch. Pharm. Res. 13, 261–264 (1990). https://doi.org/10.1007/BF02856532
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DOI: https://doi.org/10.1007/BF02856532