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A Modified, Economical and Efficient Synthesis of Variably Substituted Pyrazolo[4,3-d]pyrimidin-7-ones.

✍ Scribed by Khalid Mohammed Khan; Ghulam Murtaza Maharvi; Muhammad Igbal Choudhary; Atta-ur-Rahman Atta-ur-Rahman; Shahnaz Perveen

Publisher
John Wiley and Sons
Year
2006
Weight
24 KB
Volume
37
Category
Article
ISSN
0931-7597

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## Abstract A general synthetic approach to pyrazolo[4,3‐__d__]pyrimidines is reported. Aldehydes, arylideneanilines, carboxylic acids and orthoesters are used as one‐carbon units for bridging the two amino functions of 4‐amino‐1‐alkyl‐3‐propylpyrazole‐5‐carboxamides.

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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.