C([O:8][C:9]1[CH:31]=[CH:30][C:12]([O:13][CH2:14][CH2:15][CH2:16][CH2:17][N:18]2[C:28](=[O:29])[C:27]3[C:22](=[CH:23][CH:24]=[CH:25][CH:26]=3)[S:19]2(=[O:21])=[O:20])=[CH:11][CH:10]=1)C1C=CC=CC=1.C1CC=CCC=1>CCO.[Pd]>[OH:8][C:9]1[CH:10]=[CH:11][C:12]([O:13][CH2:14][CH2:15][CH2:16][CH2:17][N:18]2[C:28](=[O:29])[C:27]3[C:22](=[CH:23][CH:24]=[CH:25][CH:26]=3)[S:19]2(=[O:21])=[O:20])=[CH:30][CH:31]=1To a stirred solution of 83.3 (0.1 g, 0.23 mmol) in EtOH (5 mL) was added 10% Pd/C (0.1 g, 100% w/w) and 1,4-cyclohexadiene (92 mg, 1.15 mmol) and the resulting suspension was stirred vigorously at 50° C. for 2 hours. The reaction mixture was cooled to room temperature, the catalyst was removed by filtration through Celite, and the filtrate was evaporated under reduced pressure. The residue was purified by flash column chromatography on silica gel (60% diethyl ether-hexane) to give 84 (0.044 g, 56% yield) as a white solid (m p 107-109° C.). 1H NMR (500 MHz, CDCl3) δ 8.06 (d, J=7.0 Hz, 1H), 7.92 (d, J=7.0 Hz, 1H), 7.87 (td, J=7.0 Hz, J=1.2 Hz, 1H), 7.83 (td, J=7.0 Hz, J=1.2 Hz, 1H), 6.79 (d, J=9.0 Hz, 2H), 6.74 (d, J=9.0 Hz, 2H), 4.38 (br s, 1H), 3.96 (t, J=6.4 Hz, 2H), 3.89 (t, J=7.2 Hz, 2H), 2.05 (quintet, J=6.9 Hz, 2H), 1.89 (quintet, J=6.9 Hz, 2H).
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