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[4,4′-Bi-1H-pyrazolo[3,4-b]pyridine] aus 1,6-Diaryl-1,3,4,6-hexantetronen

✍ Scribed by Sušnik-Rybarski, Ivana ;Džanić, Husein ;Laćan, Marijan ;Mesić, Vladimir

Publisher
John Wiley and Sons
Year
1982
Tongue
English
Weight
184 KB
Volume
1982
Category
Article
ISSN
0947-3440

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✦ Synopsis

[4,4′‐Bi‐1__H__‐pyrazolo[3,4‐b]pyridines] from 1,6‐Diaryl‐1,3,4,6‐hexanetetrones

Reaction of 1,6‐diaryl‐1,3,4,6‐hexanetetrones 1a–c (Ar = phenyl, p‐tolyl or 2‐thienyl) with 3‐amino‐1‐phenyl‐5‐pyrazolone (2) in the presence of piperidine leads to 6,6′‐diaryl‐2,2′‐diphenyl[4,4′‐bi‐1__H__‐pyrazolo[3,4‐b]pyridine]‐3,3′(2__H__,2′H)diones 3a‐c, which are transformed into the acetates 4a–c.

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