Methanol → HCID 18976225, compound

Participants

Reaction Steps

In one portion of 4.00 g (0.013 mole) of 3-amino-1-(4-fluorophenyl)-2,3-dihydro-5-methoxy-1H-indol-2-one hydrochloride in 80 ml of anhydrous dichloroethane, 2.69 g (0.0182 mole, 1.4 equivalent) of phthalic anhydride was added to a stirred suspension under argon atmosphere. 2 ml (0.0143 mole) of triethylamine was added dropwise to this mixture over 10 minutes. Then, after the whole was stirred at room temperature for 10 minutes, it was further refluxed over an oil bath overnight. Excessive phthalic anhydride was decomposed by adding a mixture of 2 ml of triethylamine and 2 ml of methanol and refluxing the resulting mixture for 20 minutes. The reaction mixture was concentrated under reduced pressure and then extracted with ethyl acetate. The ethyl acetate layer was washed with water and dried. The residue obtained by removing ethyl acetate by evaporation was recrystallized from hexane-ethyl acetate to afford 4.50 g of 3-(1,2-dihydro-1,3-dioxoisoindol-2-yl)-1-(4-fluorophenyl)-2,3-dihydro-5-methoxy-1H-indol-2-one as colorless crystals. Melting point: 208.5° to 210.0° C., IR (Nujol) (cm-1): 1730, 1715, 1495, 1400, 1225, 1210, 750, 715, MS (DI, m/e): 402 (M+, base), 227, 184, 76.

Provenance & Evidence