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Synthesis of 3,5-Difunctionalized 1-Methyl-1H-pyrazolo [3,4-b]Pyridines Involving Palladium-Mediated Coupling Reactions.

✍ Scribed by G. Lavecchia; S. Berteina-Raboin; G. Guillaumet

Publisher: John Wiley and Sons
Year: 2004
Weight: 29 KB
Volume: 35
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.200450112

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m. p.=248-250GC (dec.; from methanol); [.ID= -129.' (DMSO, c = 1.00); 'H-NMR (D6-DMSO); t=4.13 and 4.18 (s, I-H+l'-H and s, 2 2-benzyl-H, or vice versa); MS: 520 (M+)]. The amino ketone ( 8 ) is probably first formed, being later aromatized by dimerization and air oxidation to yield ( 9 ) . The firs