Reaction Steps
To a solution of (2S)-2-(6-methoxy(2-naphthyl))propanoic acid (naproxen, 33.5 g, 0.145 mol) and ((4R)-2,2-dimethyl-1,3-dioxolan-4-yl)methan-1-ol (15 g, 0.113 mol) in anhydrous dichloromethane (750 mL) were added 1-ethyl-3-(3-dimethylaminopropyl)carbamide hydrochloride (EDAC, 23 g, 0.12 mol) and N,N-dimethylaminopyridine (DMAP, 7.5 g, 61 mmol) at room temperature under nitrogen atmosphere. The reaction mixture was stirred at room temperature overnight, then quenched with water. The organic layer was washed with brine, dried over sodium sulfate, filtered, and solvent evaporated under reduced temperature. The product was purified by column chromatography on silica gel eluting with EtOAc:hexane (2:8) to give the title compound (35.8 g, 92% yield) as a white solid. Mp 79–80° C. 1H NMR (CDCl3) δ 7.76 (d, J=9.1 Hz, 2H), 7.46 (dd, J=8.7, 1.8 Hz, 1H), 7.19 (m, 2H), 7.0 (s, 1H), 4.28 (m, 1H), 4.18 (m, 2H), 4.0 (n, 2H), 3.94 (3H), 3.68 (m, 1H), 1.65 (d, J=7.1 Hz, 3H), 1.41 (s, 3H), 1.38 (s, 3H); 13C NMR (75 MHz, CDCl3)δ 174.4, 157.6, 135.3, 133.7, 129.2, 128.9, 127.1, 126.1, 126.0, 119.0, 109.6, 105.5, 73.4, 66.1, 64.4, 55.2, 45.2, 26.5, 25.3, 18.4; LRMS (APIMS) m/z 345 (MH).
