5-{2-[5-trifluoromethyl-2-benzyloxyphenyl]cyclopent-1-enyl}-3-aminobenzoic acid ethyl ester (210 mg, 0.43 mmol), sodium hydride (17 mg, 0.43 mmol), iodomethane (0.027 mL, 0.43 mmol), in 3 mL of DMF were stirred at room temperature for 24 hrs, then another 0.027 mL of iodomethane were added and the reaction mixture was stirred for another 48 hrs. The mixture was then poured into water and extracted with ethyl acetate (3×10 mL). The combined organic layers were dried (MgSO4), and concentrated. Purification was carried out on SPE using iso-hexane containing a gradient of ethylacetate (20–30%) to give the required product as a yellow oil. (85 mg, 39%).
