Regioselective synthesis of 4-nitro- or 4-chloro-tetrasubstituted pyrazoles from hydrazones and β-halo-β-nitrostyrenes
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,
Deng, Xiaohu,Liang, Jimmy T.,Mani, Neelakandha S.
p. 410 - 417
(2014/01/23)
1-Methyl(or phenyl)-5-(penta-O-acetyl-D-galacto-penitol-1-yl)pyrazoles from the reactions of 3,4,5,6,7-penta-O-acetyl-1,2-dideoxy-1-nitro-D-galacto-hept-1-enitol with aldehyde methyl(or phenyl)hydrazones
The title hept-1-enitol (2) reacted with aldehyde methyl(or phenyl)hydrazones in refluxing methanol or butyl acetate to give 1-methyl(or phenyl)-5-(penta-O-acetyl-D-galcto-pentitol-1-yl)pyrazoles in good (for 1-methylpyrazoles) or moderate yields (for 1-p
Gomez-Guillen, Manuel,Simon, Jose Maria Lassaletta
p. 175 - 189
(2007/10/02)
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