Gavrilenko, B. B. published the artcileReaction of enamines with hydrazine, Safety of Ethyl 5-amino-3-methyl-1H-pyrazole-4-carboxylate, the publication is Zhurnal Organicheskoi Khimii (1974), 10(3), 601-4, database is CAplus.
RR1C:C(NH2)NHNH2 (I; R = CO2Me, CO2Et, CO2Pr, CO2Ph, R1 = CO2Me, CO2Et, CN) were obtained in 78-90% yields by boiling RR1C:C(CCl3)NH2 on a water bath 3-5 min. Pyrazoles (II; R1 = CO2Et, CO2Pr, CO2Ph) were obtained in 80-95% yields by cyclization of the appropriate I (R = CN) in DMF containing N2H4.H2O. Analogous obtained were 70-98% pyrazoles (III; R1 = H, CO2Et,R3 = Me). Acylaminopyrazoles (IV; R1 = H, CO2Et, CO2Pr,R3 = Me, Ph, NH2, AcNH) were addnl. obtained in 78-96% yields.
Zhurnal Organicheskoi Khimii 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, Safety of Ethyl 5-amino-3-methyl-1H-pyrazole-4-carboxylate.
Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics