反应详情

A flask containing 10% Pd/C (120 mg) was evacuated and then purged under a N2 atmosphere. To this was added a solution of ethyl 3-(4-benzyloxy-3-cyclopentyl-phenyl)prop-2-enoate (1.2 g, 3.42 mmol) in ethanol (15 mL). The reaction was stirred under H2 atmosphere for 12 h at room temperature. The catalyst was filtered off and the solvent was removed under reduced pressure. Purification by silica gel chromatography (0-30% ethyl acetate/hexanes) afforded ethyl 3-(3-cyclopentyl-4-hydroxy-phenyl)propanoate (857 mg, 96% yield). 1H NMR (400.0 MHz, DMSO-d6) δ 9.01 (s, 1H), 6.93 (d, J=2.1 Hz, 1H), 6.79 (dd, J=2.2, 8.1 Hz, 1H), 6.65 (d, J=8.1 Hz, 1H), 4.02 (q, J=7.1 Hz, 2H), 3.21-3.12 (m, 1H), 2.71 (t, J=7.5 Hz, 2H), 2.53-2.50 (m, obscured by DMSO peak, 2H), 1.92-1.85 (m, 2H), 1.78-1.68 (m, 2H), 1.66-1.55 (m, 2H), 1.54-1.45 (m, 2H), 1.15 (t, J=7.1 Hz, 3H).

1. customwas evacuated
2. custompurged under a N2 atmosphere
3. filtrationThe catalyst was filtered off
4. customthe solvent was removed under reduced pressure
5. customPurification by silica gel chromatography (0-30% ethyl acetate/hexanes)