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[4,4′‐Bi‐1 H ‐pyrazolo[3,4‐ b ]pyridine] aus 1,6‐Diaryl‐1,3,4,6‐hexantetronen
Author(s) -
SušnikRybarski Ivana,
Džanić Husein,
Laćan Marijan,
Mesić Vladimir
Publication year - 1982
Publication title -
liebigs annalen der chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 0170-2041
DOI - 10.1002/jlac.198219820223
Subject(s) - chemistry , pyridine , piperidine , pyrazolone , medicinal chemistry , stereochemistry
[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 .