Saito, Koji published the artcileFormation of pyrazolo[1,5-a]pyrimidine derivatives. II. Reaction of ethyl ethoxymethylenecyanoacetate with its hydrazino derivatives, Computed Properties of 23286-70-6, the publication is Bulletin of the Chemical Society of Japan (1974), 47(2), 476-80, database is CAplus.
The reaction of ethyl ethoxymethylenecyanoacetate with its hydrazino derivative in the presence of pyridine in EtOH at room temperature gave ethyl (4-ethoxycarbonyl-5-aminopyrazol-1-yl)methylenecyanoacetate (I) and two geometric isomers of ethyl (4-ethoxycarbonylpyrazol-5-ylamino)methylenecyanoacetate (II) I under the same conditions rearranged to II. I and II upon heating cyclized exclusively to the same product, diethyl 7-aminopyrazolo[1,5-a]pyrimidine-3,6-dicarboxylate III.
Bulletin of the Chemical Society of Japan published new progress about 23286-70-6. 23286-70-6 belongs to pyrazoles-derivatives, auxiliary class Pyrazole,Amine,Ester, name is Ethyl 5-amino-3-methyl-1H-pyrazole-4-carboxylate, and the molecular formula is C7H11N3O2, Computed Properties of 23286-70-6.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics