✦ LIBER ✦

Potential Purine Antagonists. II. Synthesis of Some 7- and 5,7-Substituted Pyrazolo[4,3-d]pyrimidines 1

✍ Scribed by Robins, Roland K.; Furcht, Frederick W.; Grauer, Alan D.; Jones, Jesse W.

Book ID: 120313203
Publisher: American Chemical Society
Year: 1956
Tongue: English
Weight: 617 KB
Volume: 78
Category: Article
ISSN: 0002-7863
DOI: 10.1021/ja01592a021

No coin nor oath required. For personal study only.

📜 SIMILAR VOLUMES

Potential Purine Antagonists. V. Synthes

Potential Purine Antagonists. V. Synthesis of Some 3-Methyl-5,7-substituted Pyrazolo[4,3- d ]pyrimidines

✍ ROBINS, ROLAND K.; HOLUM, LEE B.; FURCHT, FREDERICK W. 📂 Article 📅 1956 🏛 American Chemical Society 🌐 English ⚖ 430 KB

Potential Purine Antagonists. I. Synthes

Potential Purine Antagonists. I. Synthesis of Some 4,6-Substituted Pyrazolo [3,4-d] pyrimidines1

✍ Robins, Roland K. 📂 Article 📅 1956 🏛 American Chemical Society 🌐 English ⚖ 873 KB

Potential Purine Antagonists. XXIII. Syn

Potential Purine Antagonists. XXIII. Synthesis of Some 7-Substituted Amino-v-triazolo(d)pyrimidines 1

✍ WEISS, RONALD; ROBINS, ROLAND K.; NOELL, C. WAYNE 📂 Article 📅 1960 🏛 American Chemical Society 🌐 English ⚖ 683 KB

Pyrazolo[4,3-d]pyrimidine nucleosides. S

Pyrazolo[4,3-d]pyrimidine nucleosides. Synthesis and antiviral activity of 1-.beta.-D-ribofuranosyl-3-methyl-6-substituted-7H-pyrazolo[4,3-d]pyrimidin-7-ones

✍ Baraldi, Pier Giovanni; Simoni, Daniele; Periotto, Vittorio; Manfredini, Stefano 📂 Article 📅 1984 🏛 American Chemical Society 🌐 English ⚖ 663 KB

Synthesis of novel 2,3-substituted-2,4-d

Synthesis of novel 2,3-substituted-2,4-dihydro-pyrazolo[4,3-d]pyrimidine-5,7-diones

✍ Thomas Brady; Khang Vu; Jack R. Barber; Shi Chung Ng; Yuefen Zhou 📂 Article 📅 2009 🏛 Elsevier Science 🌐 French ⚖ 440 KB

Novel 2,3-substituted-2,4-dihydro-pyrazolo[4,3-d] pyrimidine-5,7-diones were successfully synthesized with moderate to good yields using a new synthetic approach. The structures of the regio-isomers in this series were determined by single crystal X-ray analysis and NMR spectra.

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.