Acetic Anhydride → HCID 21901895, compound

Participants

Reaction Steps

Acetic acid anhydride (0.132 ml) was added to a solution of 1-(3-amino-4-methoxyphenyl)-3-{1-[2-(2-ethoxyphenoxy)ethyl]-4-piperidinyl}-1-propanone dihydrochloride (300 mg) obtained in Example 327 and triethylamine (0.195 ml) in tetrahydrofuran (10 ml) at room temperature, the mixture was stirred for 12 hours, and the reaction mixture was concentrated under reduced pressure. Water (30 ml) and ethyl acetate (40 ml) were added to the residue, and extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The resulting residue was purified by silica gel chromatography (eluting solvent; ethyl acetate-methanol (9:1)) to give a free base compound of the title compound as a colorless oil (276 mg). The free base compound (270 mg) was treated with a hydrogen chloride-ethanol solution to give the title compound (277 mg) as colorless crystals having a melting point of 127 to 129° C.

Provenance & Evidence