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Facile Synthesis of Pyrazolo[3,4‐ d ]pyrimidines and Pyrimido[4,5‐ d ]pyrimidin‐4‐one Derivatives

✍ Scribed by Babu Katiyar, Sanjay; Kumar, Arun; Chauhan, Prem M. S.


Book ID
120558921
Publisher
Taylor and Francis Group
Year
2006
Tongue
English
Weight
112 KB
Volume
36
Category
Article
ISSN
0039-7911

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A convenient synthesis of pyrazolo[3,4-d
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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.

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