[(4,4-Dimethyl-3,4-dihydro-2H-chromen-7-yl)oxy]acetic acid (118 mg, 0.5 mmol), 2-chloro-1,3-dimethylimidazolinium chloride (CDI) (89 mg, 0.55 mmol), triethylamine (0.33 ml) and N{4-(aminomethyl)-2-fluorophenyl]methanesulfonamide hydrochloride (140 mg, 0.55 mmol) were treated in the same procedure described in Example 2(b). The crude residue was applied to a silica gel chromatography column and eluted with a volume mixture of hexane and ethyl acetate (3/1 to 1/1) to furnish 43 mg (20% yield) of the title compound as a white solid.
