Sodium Carbonate → 1-[2-(2,3-Dihydro-1,4-benzodioxin-2-yl)ethyl]piperidin-4-one

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Reaction Steps

The starting material is prepared as follows: The mixture of 10 g of 2-(2-tosyloxyethyl)-1,4-benzodioxan, 10 g of 4-piperidone hydrochloride, 20 g of anhydrous sodium carbonate and 160 ml of dimethylformamide is stirred vigorously at room temperature for 48 hours. It is filtered, the residue washed with a small amount of dimethylformamide and the filtrate evaporated. The residue is dissolved in ethyl acetate, the solution extracted with hydrochloric acid, the extract make alkaline with 50% aqueous sodium hydroxide while cooling and re-extracted with methylene chloride. The latter extract is dried and evaporated, to yield the 2-[2-(4-oxopiperidino)-ethyl]-1,4-benzodioxan, which solidifies on standing.

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