Hydrochloric Acid → 2-[4-[(Dimethylamino)methyl]phenyl]-3-oxa-1-azaspiro[4.5]dec-1-en-4-one

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Reaction Steps

0.7 ml of 2N aqueous sodium hydroxide solution was added to a solution of 100 mg (0.25 mmol) of 1-[[[4-[(dimethylamino)methyl]phenyl]carbonyl]amino]cyclohexanecarboxylic acid phenylmethyl ester in 1 ml of tetrahydrofuran, and the mixture was heated under reflux overnight. After the reaction mixture was neutralized by concentrated hydrochloric acid, the reaction mixture was distilled off under reduced pressure. 3 ml of methylene chloride, 126 mg (1.25 mmol) of triethylamine and 96 mg (0.5 mmol) of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride were added to the residue, and the mixture was stirred for 1 hour. The reaction solution was distilled off under reduced pressure, a saturated aqueous sodium bicarbonate solution was added thereto, and the mixture was extracted with ethyl acetate. The organic layer was washed with a saturated aqueous sodium bicarbonate solution and dried with anhydrous sodium sulfate. The solvent was distilled off under reduced pressure to obtain 52 mg (68%) of the title compound.

Provenance & Evidence