Cyclization Reactions of 5‐Aminopyrazoles with β‐Ketoesters,Enamines and β‐Keto Anilides: New Synthetic Routes to Pyrazolo[1,5‐a]Pyrimidine Derivatives |
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| Authors: | F. M. A. El‐Taweel T. M. Abu Elmaati |
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| Abstract: | The pyrazolo[1,5‐a]pyrimidines 4, 10, 11 and 14 were synthesized from reaction of 4‐aryazo‐2,5‐diaminopyrazoles 1 with cyclic β‐ketoesters 2a,b or cyclic β‐ketoesters 7, 8 or acetoacetanilide 12 , respectively. The reaction of 1 with the enamines 15, 16 and 17 yielded also the pyrazolo[1,5‐a]pyrimidines 18, 20 and 21 , respectively. |
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| Keywords: | 2,5‐Diaminopyrazoles Pyrazolo[1,5‐a]pyrimidines |
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