93575-17-8

Upstream product

• 93546-20-4 [1-(3-Chloro-5-phenyl-5H-pyrazolo[4,3-c]pyridin-7-yl)-meth-(E)-ylidene]-phenyl-amine 
• 93546-24-8 3-chloro-7-formyl-5-phenyl-5H-pyrazolo<4,3-c>pyridine 
• 94086-37-0 3-chloro-7-formyl-5-phenyl-5H-pyrazolo<4,3-c>pyridine oxime 

Relevant academic research and scientific papers

Studies in Vilsmeier-Haack Reactions: Part XXIV - Synthesis of 5-Phenylpyrazolopyridine Derivatives

Vilsmeier-Haack reaction on 3-methyl-5-pyrazolone affords the trialdehyde (III) which reacts with arylamines in situ to give the schiff bases (VII) of the 5-aryl-3-chloro-7-formyl-5H-pyrazolopyridine derivatives (VIII).Reaction of III with ammonium chloride, on the other hand, furnishes 3-chloro-7-formyl-1H-pyrazolopyridine (IV).