Carbon Dioxide → 2-(2,3-Dihydro-1,4-benzodioxin-2-yl)-1-(4-hydroxy-4-phenylpiperidin-1-yl)ethan-1-one

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Reaction Steps

To the stirred solution of 11.64 g of 2-(1,4-benzodioxan-2-yl)-acetic acid in 60 ml of tetrahydrofuran is added 12 g of 1,1-carbonyldiimidazole. After the evolution of carbon dioxide has ceased, 10.6 g of 4-hydroxy-4-phenylpiperidine are added and the mixture stirred overnight at room temperature. It is evaporated, the residue taken up in ethyl acetate, the solution washed with water, N hydrochloric acid and water, dried and evaporated, to yield the 1-[2-(1,4-benzodioxan-2-yl)-acetyl]-4-hydroxy-4-phenylpiperidine.

Provenance & Evidence