Baba, Hideo published the artcileReactions of 伪-cyano-尾-methoxy-尾-alkylacrylic esters with hydrazine and hydroxylamine, Recommanded Product: Ethyl 5-amino-3-methyl-1H-pyrazole-4-carboxylate, the publication is Bulletin of the Chemical Society of Japan (1969), 42(6), 1653-9, database is CAplus.
伪-Cyano-尾-methoxy-尾-alkyl (Me, Et, Pr, Bu, amyl, and iso-Bu) acrylic esters (I) react with hydrazine to give 尾-hydrazino intermediates. The hydrazino group of these intermediates is cyclized preferentially between its terminal NH2 and the cyano group in a neutral or acidic medium to give 5-aminopyrazole derivatives and preferentially between the terminal NH2 and the ester group in the presence of a base to give 5-pyrazolinone derivatives When the 尾-alkyl group of I is isopropyl, tertbutyl, etc., I affords only the 5-pyrazolinone derivatives in the reaction with hydrazine. The reactions of I with hydroxylamine gave 5-aminoisoxazole derivatives, but in the case of the 尾-tert-butyl derivative of I, they gave 5-aminoisoxazole accompanied by the 5-isoxazolinone derivative
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, Recommanded Product: Ethyl 5-amino-3-methyl-1H-pyrazole-4-carboxylate.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics