Abstract
AbstractResearch often leads to unprecedented results that open the gates for new methodologies. We report herein the oxidative aromatization and serendipitous regioselective nitration of 1,3,5‐trisubstituted‐4,5‐dihydro‐1H‐pyrazoles under mild reaction conditions using SiO2‐HNO3 as an oxidizing agent to afford 1,3,5‐trisubstituted pyrazoles with high regioselectivity. Here SiO2‐HNO3 acts as a nitrating agent along with oxidizing property. SiO2‐HNO3 is cheap, easy to prepare, eco‐friendly and practically applicable catalyst.
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