A series of novel heterocycles 1-aryl-or alkyl-substituted-4-arylazamethylene-6-arylpyrazolo[5,4-d]-1,3-oxazines were synthesized from the acylation of (5-amino-1-substituted-pyrazol-4-yl)-N-carboxamide in 63-89% isolated yields at room temperature within 12 hours. The structure was confirmed by X-ray crystal analysis.

LV, H.; WANG, J.; QIU, G.; HU, X.; J. Heterocycl. Chem. 45 (2008) 2, 365-369; Coll. Pharm., Wuhan Univ., Wuhan, Hubei 430072, Peop. Rep. China; Eng.) -H. Haber 29-160