A mixture of ethyl 2-{[6-(3-pentanoyl-1-benzofuran-2-yl)-2-naphthyl]oxy}-3-phenylpropanoate (4.10 g, 7.88 mmol), potassium hydroxide (1.35 g, 24.1 mmol) in THF (66 mL) and water (66 mL) was stirred for 2 hours at room temperature. The mixture was poured into excess water and washed with diethyl ether. The aqueous phase was acidified with 2N hydrochloric acid and extracted with ethyl acetate. The organic extract was washed with brine, dried over anhydrous magnesium sulfate, filtered and concentrated. The residue was treated with hexane and the formed solid was crystallized from acetonitrile. Drying at 82° C. for 16 hours afforded the title compound as a light yellow solid (2.87 g), mp 144-145° C. Mass spectrum (+ESI, [M+H]+) m/z 493. 1HNMR (500 MHz, DMSO-d6): δ13.1-13.5 (br s, 1H), 8.35 (s, 1H), 7.95-8.05 (m, 2H), 7.9 (d, 1H, J=8.6 Hz), 7.8 (dd, 1H, J=8.6 Hz and 1.7 Hz), 7.7 (dd, 1H, J=7.4 Hz and 0.84 Hz), 7.2-7.45 (m, 9H), 5.2 (q, 2H, J=4.2 Hz), 3.2-3.25 (m, 1H), 2.7 (t, 2H, J=7.3 Hz), 1.5-1.55 (m, 2H), 1.1-1.15 (m, 2H), and 0.7 and ppm (t, 3H, J=7.3 Hz). Elemental Analysis for C32H28O5: Calculated: C, 78.03; H, 5.73; N, 0.00. Found: C, 77.83; H, 5.55; N, 0.02.
