Synthesis of 2,5,7‐Triaryl‐4,7(6,7)‐dihydropyrazolo[1,5‐a]pyrimidine‐3‐carbonitriles by Reaction of 5(3)‐Amino‐3(5)‐aryl‐1H‐pyrazole‐4‐carbonitriles with Chalcones |
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| Authors: | Maksim A Kolosov Dmitriy A Beloborodov Olesia G Kulyk Valeriy D Orlov |
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| Institution: | V.N. Karazin Kharkiv National University, Kharkiv, Ukraine |
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| Abstract: | The reaction of 5(3)‐amino‐3(5)‐aryl‐1H‐pyrazole‐4‐carbonitriles with 1,3‐diaryl‐2‐propen‐1‐ones (chalcones) in refluxing DMF leads to 2,5,7‐triaryl‐4,7(6,7)‐dihydropyrazolo1,5‐a]pyrimidine‐3‐carbonitriles. In DMSO solution, the latter exist in equilibrium of two tautomeric 4,7‐dihydropyrazolo1,5‐a]pyrimidines and 6,7‐dihydropyrazolo1,5‐a]pyrimidines in various ratios, depending on the nature of aryl substituents in chalcone building blocks. |
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