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Cyclization of the arylazo cyanoacatate derivative 3 with amino compounds; formation of substituted pyrazoles, isoxazoles, pyrazolopyrimidines, pyrimidines and 1,3-thiazines.
Reaction conditions: (a) hydrazine hydrate, Phenyl hydrazine, benzoyl hydrazine or thiosimicarbazide/dioxane/∆; (b) hydroxylamine hydrochloride/dioxane/AcONa/∆; (c) cyanoacetohydrazide/dioxane/Et3N/∆; (d) urea/EtOH/EtONa/∆; (e) thiourea or guanidine. HCl/EtOH/EtONa/∆.
