Water → 3-(4-{[4-(2-Ethoxycarbonyl-2-methylpropyl)-phenyl]-hydroxymethyl}-phenyl)-2,2-dimethylpropionic acid ethyl ester

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Reaction Steps

A solution of 3-{4-[4-(2-ethoxycarbonyl-2-methylpropyl)-benzoyl]-phenyl}-2,2-dimethyl-propionic acid ethyl ester (4.40 g, 10.0 mmol) in methanol (80 mL) was cooled in an ice-water bath. Sodium borohydride (0.45 g, 13.7 mmol) was added and the mixture was stirred for 5 h. Water (150 mL) and dichloromethane (65 mL) were added and the layers were separated. The aqueous layer was washed with dichloromethane (2×65 mL). The combined organic layers were washed with saturated NaCl solution (100 mL), dried over MgSO4, and concentrated under vacuum. The residue was subjected to column chromatography on silica using hexanes/ethyl acetate (9:1 and 6:1) as eluent to afford 3-(4-{[4-(2-ethoxycarbonyl-2-methylpropyl)-phenyl]-hydroxymethyl}-phenyl)-2,2-dimethylpropionic acid ethyl ester (3.63 g, 82%) as a colorless oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 7.24 (d, 4H, J=8.0 Hz), 7.07 (d, 4H, J=8.0 Hz), 5.77 (s, 1H), 4.08 (q, 4H, J=7.1 Hz), 2.83 (s, 4H), 2.62 (s, 1H), 1.21 (t, 6H, J=7.1 Hz), 1.16 (s, 12H). 13C NMR (75 MHz, CDCl3=77.23 ppm): δ (ppm): 177.6, 142.2, 137.3, 130.3, 126.3, 75.9, 60.5, 46.0, 43.4, 25.1, 14.3. HRMS (LSIMS, nba): Calcd for C27H35O4 (M+H−H2O): 423.2535. found: 423.2520.

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