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ChemInform Abstract: An Efficient Synthesis of Pyrazolo[3,4-b]pyrrolo[2,3-d]pyridines from 5-Aminopyrazoles and Cyclic β-Keto Ester.

✍ Scribed by Raghunath B. Toche; Bhausaheb K. Ghotekar; Dhananjay B. Kendre; Muddassar A. Kazi; Madhukar N. Jachak

Publisher: John Wiley and Sons
Year: 2009
Weight: 35 KB
Volume: 40
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.200915157

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## Abstract magnified image 5‐Chloroethylpyrazolo[3,4‐__b__]pyridines were synthesized by condensation of 5‐aminopyrazoles with α‐acetyl γ‐butyrolactone followed by cyclization treating with phosphorous oxychloride. 5‐Chloroethyl‐pyrazolo[3,4‐__b__]pyridines, thus obtained, were then converted to

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Reaction of 5-Aminopyrazoles with β-Dimethylaminopropiophenones. Synthesis of New Pyrazolo [3,4-b]pyridines. -Reaction of 5aminopyrazoles (I) with β-aminopropiophenones (II) provides a new and simple synthetic entry into the pyrazolo[3,4-b]pyridine ring system. Oxidation of the dihydro-products (II

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## Abstract 5 or 7‐Trifluoromethyl‐1,2,3,4‐tetrahydropyrido[2,3‐__d__]pyrimidine‐2,4‐diones **3**, **5**, **10**, **13** and 4‐ or 6‐trifluoromethylpyrazolo[3,4‐__b__]pyridines **15**, **16**, **19**, **21** were prepared from 6‐aminouracils and 5‐aminopyrazoles, respectively, in good yields by the