Cesium carbonate → (+/-)-3-[4-(4'-Trifluoromethyl-biphenyl-3-ylmethoxy)-phenyl]-3-(thiazol-2-yl)-propionic acid

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Reaction Conditions

Reaction Steps

Benzyl chloride 2.3 (123 mg, 0.456 mmol) and phenol 53.1 (100 mg, 0.380 mmol) were dissolved in acetone (1 mL) and treated with Cs2CO3 (371 mg, 1.14 mmol). The reaction was stirred at 50° C. for 16 h, filtered and concentrated. The residue was purified by column chromatography (silica gel, 30% to 70% ethyl acetate in hexanes). Eluant containing desired compound was concentrated and dissolved in a THF/MeOH/2N LiOH(aq) (1:1:1) solution (2 mL). The mixture was stirred at room temperature for 90 min., and the solution was poured into 0.65 N HCl(aq.) (2 mL). The aqueous phase was extracted with dichloromethane (3×10 mL) and the combined organic phases were dried over Na2SO4. After filtration and drying, 150 mg (0.311 mmol) of carboxylic acid 53 was obtained. 1H NMR (400 MHz) (CDCl3) δ 7.47-7.77 (m, 9H), 7.24-7.27 (m, 3H), 6.99-7.00 (m, 2H), 5.14 (s, 2H), 4.78 (dd, 1H, J=6.8, 4.4 Hz), 3.47 (dd, 1H, J=12.8, 6.8 Hz), 3.09 (dd, 1H, J=12.8, 4.4 Hz).

Provenance & Evidence