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The strategy of utilizing nitrogen compounds in various biological applications has recently emerged as a powerful approach to exploring novel classes of therapeutics to face the challenge of diseases. A series of pyrazolo[1,5‐a]pyrimidine‐based compounds 3a–l and 5a–f were prepared by the direct cyclo‐condensation reaction of 5‐amino‐1H‐pyrazoles 1a, b with 2‐(arylidene)malononitriles and 3‐(dimethylamino)‐1‐aryl‐prop‐2‐en‐1‐ones,...
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