Potassium Carbonate → Hydrochloric Acid

Participants

Reaction Conditions

Reaction Steps

To a solution of 0.076 g of potassium carbonate (0.54 mmol) in 1 ml. of water was added a solution of 0.18 g of {(1R)-1-cyclohexylmethyl-2-[4-(2-methoxyphenyl)-piperidin-1-yl]-ethyl}-amine (0.54 mmol) in 10 mL of dichloromethane. The resulting mixture was cooled to 0° C. and 0.085 g of 1-methyl -cyclohexanecarbonyl chloride (0.54 mmol) was added. The reaction was allowed to stir overnight at 0° C., and was then diluted with 5 mL of water and 20 mL of dichloromethane and the phases separated. The aqueous phase was extracted with three additional portions of dichloromethane, and the combined organic phases were dried over anhydrous sodium sulfate, filtered and concentrated on a rotary evaporator to yield the crude product, which was purified by flash chromatography on silica gel (dichloromethane/methanol) and converted to the hydrochloride. 0.75 hydrate salt of the title compound with isopropanolic HCl to yield 0.35 g (55%) as a white solid; mp=208-210° C.; MS(+)ESI m/z=455 (M+H)+.

Provenance & Evidence