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

✍ Scribed by Thomas Brady; Khang Vu; Jack R. Barber; Shi Chung Ng; Yuefen Zhou

Publisher: Elsevier Science
Year: 2009
Tongue: French
Weight: 440 KB
Volume: 50
Category: Article
ISSN: 0040-4039
DOI: 10.1016/j.tetlet.2009.08.098

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✦ Synopsis

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.

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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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Efficient synthesis of novel pyrido[3,2-

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