16713-37-4Relevant articles and documents
Regioselective synthesis of 4-nitro- or 4-chloro-tetrasubstituted pyrazoles from hydrazones and β-halo-β-nitrostyrenes
Deng, Xiaohu,Liang, Jimmy T.,Mani, Neelakandha S.
, p. 410 - 417 (2014/01/23)
We report an acid-catalyzed cycloaddition reaction of hydrazones with β-bromo- or β-chloro-β-nitrostyrenes for the regioselective synthesis of 4-nitro- or 4-chloro-tetrasubstituted pyrazoles. Arising from a common 4-halo-4-nitropyrazolidine intermediate,