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Recent Syntheses of Pyrazolo[3,4-d]pyrimidine Ring Systems

✍ Scribed by Qun Dang

Publisher
John Wiley and Sons
Year
2005
Weight
8 KB
Volume
36
Category
Article
ISSN
0931-7597

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A convenient synthesis of pyrazolo[3,4-d
A convenient synthesis of pyrazolo[3,4-d]pyrimidine-4,6-dione and pyrazolo[4,3-d]pyrimidine-5,7-dione derivatives
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## Abstract Pyrazolo‐[3,4‐__d__]pyrimidine‐4,6‐diones **5** and pyrazolo[4,3‐__d__]pyrimidine‐5,7‐diones **7** were synthesized by Curtius rearrangement of pyrazolic mono‐esters **2** and **3** followed by hetero‐cyclization __via__ the ureas derivatives **4** and **6** under alkaline conditions.

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,

ChemInform Abstract: A Convenient Synthe
ChemInform Abstract: A Convenient Synthesis of Pyrazolo[3,4-d]pyrimidine-4,6-dione and Pyrazolo[4,3-d]pyrimidine-5,7-dione Derivatives.
✍ M. El Haddad; M. Soukri; S. Lazar; A. Bennamara; G. Guillaumet; M. Akssira 📂 Article 📅 2001 🏛 John Wiley and Sons ⚖ 31 KB 👁 1 views

## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable v