A convenient synthesis of pyrazolo[3,4‐d]pyrimidine‐4,6‐dione and pyrazolo[4,3‐d]pyrimidine‐5,7‐dione derivatives |
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Authors: | M El Haddad M Soukri S Lazar A Bennamara G Guillaumet M Akssira |
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Abstract: | Pyrazolo‐3,4‐d]pyrimidine‐4,6‐diones 5 and pyrazolo4,3‐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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