Chemistry of Heterocyclic Compounds p. 65 - 69 (2000)
Update date:2022-08-02
Topics:
Makarov
Solov'eva
Ryabova
Granik
Two major compounds are formed in the reaction of 3,5-diamino-4-nitropyrazole with acetoacetic ester: 2-amino-5-methyl-3-nitro-4,7-dihydropyrazolo[1,5-a]pyrimidin-7-one and 3-amino-5-(β-hydroxycrotonyl)amino-4-nitropyrazole. The latter is converted to bicyclic dihydropyrazolo[1,5-a]-pyrimidinone in solutions with heating.
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