Abstract
A novel Vilsmeier-type methylenation for synthesis of dipyrazolylmethanes was developed by reacting pyrazolones with formamide or N-methylformamide in the presence of phosphorous oxychloride POCl 3 coupling agent. This method can efficiently provide a series of dipyrazolylmethane derivatives as the main products in excellent yields without the formylated products. Our experimental result was different with the classical Vilsmeier-type reaction.
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