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

Participants

Reaction Steps

2 ml of 2N aqueous sodium hydroxide solution was added to a solution of 300 mg (0.69 mmol) of 1-[[[4-(4-morpholinylmethyl)phenyl]carbonyl]amino]cyclohexanecarboxylic acid phenylmethyl ester in 2 ml of tetrahydrofuran, and the mixture was heated under reflux overnight. After the mixture was neutralized by concentrated hydrochloric acid, the reaction solution was distilled off under reduced pressure. 3 ml of methylene chloride, 698 mg (6.9 mmol) of triethylamine and 264 mg (1.38 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 it was dried with anhydrous sodium sulfate. The solvent was distilled off under reduced pressure to obtain 191 mg (80%) of the title compound.

Provenance & Evidence