Elfahham, Hassan Attia published the artcileNovel synthesis of pyrazolo[5,1-c]-1,2,4-triazoles, imidazo[1,2-b]pyrazoles, and [1,2,4]-triazolo[4,3-a]benzimidazoles. Reaction of nitrile imines with amino- and oxo-substituted diazoles, Safety of 5-Phenyl-1H-pyrazol-3(2H)-one, the main research area is pyrazolotriazole; imidazopyrazole; triazolobenzimidazole; hydrazonyl chloride condensation cyclization diazole.
RCCl:NNHPh (I; R = Ph, COMe) reacted with cyclic amidines and azolones to give condensation products. In some cases intramol. cyclocondensation occurred to give the title heterocyclic compounds E.g., reaction of antipyrine II (R = H) with I (R = Ph) in refluxing EtOH containing Et3N for 3 h gave 86% II (R = CPh:NNHPh) whereas reaction of I (R = COMe) with pyrazole III under the above conditions gave 91% pyrazolotriazole IV.
Journal of the Chemical Society, Perkin Transactions 11: Organic and Bio-Organic Chemistry published new progress about Condensation reaction. 27412-71-1 belongs to class pyrazoles-derivatives, name is 5-Phenyl-1H-pyrazol-3(2H)-one, and the molecular formula is C9H8N2O, Safety of 5-Phenyl-1H-pyrazol-3(2H)-one.
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics