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Synthesis of 4-acetyl-5(3)-amino-3(5)-methylpyrazoles and pyrazolo[3,4-d]pyrimidines from diacetylketeneN,S-acetal

✍ Scribed by V. A. Dorokhov; A. V. Komkov; B. I. Ugrak


Book ID
111954620
Publisher
Springer
Year
1993
Tongue
English
Weight
475 KB
Volume
42
Category
Article
ISSN
1573-9171

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A convenient synthesis of pyrazolo[3,4-d
✍ M. El Haddad; M. Soukri; S. Lazar; A. Bennamara; G. Guillaumet; M. Akssira 📂 Article 📅 2000 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 470 KB

## 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.