292600-38-5Relevant articles and documents
Synthesis of pyrazolo[1,5-a]-pyrimidines by reaction of 3,5-diamino-4-nitropyrazole with acetoacetic ester in the presence of alkaline agents
Makarov,Solov'eva,Ryabova,Granik
, p. 65 - 69 (2000)
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.