1,4-Cyclohexadiene → 4-(4-benzyl-5-methyl-1H-pyrazole-3(2H)-on-2-yl)-piperidine

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Reaction Steps

To a solution of 0.52 g of 1-benzyl-4-(4-benzyl-5-methyl-1H-pyrazol-3(2H)-on-2-yl)-piperidine in 20 mL of EtOH under nitrogen was added 0.2 g of Pearlman's catalyst and 2.5 mL of 1,4-cyclohexadiene. This mixture was refluxed for 3 hours, filtered through Celite and concentrated under reduced pressure to give 0.43 g of 4-(4-benzyl-5-methyl-1H-pyrazole-3(2H)-on-2-yl)-piperidine. ESI-MS 271.9 (M+H); HPLC A: 1.68 min.

Provenance & Evidence