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Steroid oxidations. I. A convenient synthesis of δ4-3, 6-diones

✍ Scribed by Roger D. Barry; Florence Kraft; Paige K. Besch; David J. Watson; Marvin Pflaumer

Book ID
118976951
Publisher
Elsevier Science
Year
1963
Tongue
English
Weight
223 KB
Volume
2
Category
Article
ISSN
0039-128X

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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
✍ 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.