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Beilstein J. Org. Chem. 2007, 3, No. 15, doi:10.1186/1860-5397-3-15
Graphical Abstract
Scheme 1: synthesis of Ethyl 4-amino-5-substituted-1-aryl-1H-pyrazole-3-carboxylates (4)
Scheme 2: Reactivity of pyrazole 4b with phenylisothiocyanate and acetic anhydride
Scheme 3: Conversion of pyrazole 4b Ethyl into pyrazolo[4,3-d]pyrimidine-3-carboxylate 10
Scheme 4: Conversion of arylhydrazononitriles 1 into 3-Amino-4-arylhydrazono-4H-isoxazol-5-one