[CH:1]1[C:10]2[C:5](=[CH:6][C:7]([C:11]([C@@H:13]3[C@@H:18]([CH3:19])[CH2:17][CH2:16][CH2:15][C:14]3([CH3:21])[CH3:20])=[O:12])=[CH:8][CH:9]=2)[CH:4]=[CH:3][N:2]=1.[OH-].[Na+]>C(O)(=O)C.ClCCl.[Pt](=O)=O>[CH2:1]1[C:10]2[C:5](=[CH:6][C:7]([C:11]([C@@H:13]3[C@@H:18]([CH3:19])[CH2:17][CH2:16][CH2:15][C:14]3([CH3:20])[CH3:21])=[O:12])=[CH:8][CH:9]=2)[CH2:4][CH2:3][NH:2]1To a solution of the product of Example 13a (178 mg, 0.63 mmol) in acetic acid (2 mL) was added platinum dioxide (25 mg) and the reaction was stirred at room temperature under an atmosphere of hydrogen for 4 hours. The mixture was diluted with dichloromethane (40 mL) and basified with 1 N NaOH (35 mL) and the organic phase was separated. The aqueous layer was extracted with dichloromethane (30 mL). The combined organic phase was washed with brine (50 mL), dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent: dichloromethane/methanol=50/1->10/1) to afford the title compound as a dark brown oil (130 mg, Yield: 72%). 1H NMR (400 MHz, CDCl3) δ 7.76 (d, J=8.4 Hz, 1H), 7.73 (s, 1H), 7.13 (d, J=8.4 Hz, 1H), 4.18 (s, 2H), 3.28 (t, J=6.2 Hz, 2H), 3.01 (t, J=6.2 Hz, 2H), 2.11-2.02 (m, 1H), 1.81-1.77 (m, 1H), 1.61-1.54 (m, 2H), 1.44-1.41 (m, 1H), 1.34-1.24 (m, 3H), 1.10-0.98 (m, 4H), 0.77 (s, 3H), 0.74 (d, J=6.4 Hz, 3H) ppm; Mass spectrum (ESI +ve) m/z 286 (M+H+).
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