A mixture of 4-[4-(5,6-dimethoxy-4,7-dioxoindan-2-yl)butoxy]benzoic acid (500 mg), 1-phenylpiperazine (406 mg), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (479 mg), 1-hydroxybenzotriazole monohydrate (383 mg), triethylamine (0.697 ml) in THF (20 ml) was stirred at room temperature for 6 hr. The reaction mixture was diluted with water and extracted with combined solvent of THF and ethyl acetate. The organic layer was washed with water and saturated aqueous sodium chloride and dried. The solvent was removed in vacuo. The residue was recrystallized from THF-diisopropylether to yield the entitled compound (400 mg) as crystals.
