93546-20-4Relevant academic research and scientific papers
Studies in Vilsmeier-Haack Reactions: Part XXIV - Synthesis of 5-Phenylpyrazolopyridine Derivatives
Thiruvikraman, S. V.,Seshadri, S.
, p. 768 - 769 (2007/10/02)
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).
