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Pyrazolo [3,4-b]pyridines and pyrazolo[3′,4′:6,5]pyrido[2,3-d]pyrimidines

✍ Scribed by Steve G. Cottis; Priscilla B. Clarke; Howard Tieckelmann

Book ID
112121311
Publisher
Journal of Heterocyclic Chemistry
Year
1965
Tongue
English
Weight
380 KB
Volume
2
Category
Article
ISSN
0022-152X

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Synthesis of pyrazolo-annelated heterocy
Synthesis of pyrazolo-annelated heterocyclic ring compounds such as pyrazolo[3,4-b]pyridines and pyrazolo[4′,3′:5,6]-pyrido[2,3-d]pyrimidines
✍ Madhukar N. Jachak; Appasaheb B. Avhale; Ragunath B. Toche; Ram W. Sabnis 📂 Article 📅 2007 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 311 KB 👁 1 views

## Abstract magnified image A series of pyrazolo[3,4‐__b__]pyridines has been synthesized by __Friedländer__ condensation of 5‐amino‐pyrazole‐4‐carbaldehyde **1** with active methylene compounds in basic medium. Pyrazolo[4′3′:5,6]pyrido‐[2,3‐__d__]pyrimidines have been synthesized from pyrazolo[3,

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Synthesis of trifluoromethylated pyrido[2,3-d]pyrimidine-2,4-diones from 6-aminouracils and trifluoromethylated pyrazolo[3,4-b]-pyridines from 5-aminopyrazoles
✍ Masahiko Takahashi; Hironori Nagaoka; Kazuhiro Inoue 📂 Article 📅 2004 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 213 KB 👁 1 views

## 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