[F:1][C:2]([F:26])([F:25])[S:3]([O:6][C:7]1[CH:24]=[CH:23][C:10]2[C:11](=[O:22])[C:12](=[CH:15][C:16]3[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=3)[CH2:13][O:14][C:9]=2[CH:8]=1)(=[O:5])=[O:4].[H][H]>C(OCC)(=O)C.[Pd]>[F:26][C:2]([F:1])([F:25])[S:3]([O:6][C:7]1[CH:24]=[CH:23][C:10]2[C:11](=[O:22])[C:12]([CH2:15][C:16]3[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=3)=[CH:13][O:14][C:9]=2[CH:8]=1)(=[O:4])=[O:5]To a solution of the compound of step D (26.6 g, 69.2 mmole) in 250 mL of ethyl acetate in a 500 mL Parr shaker flask was added 10% palladium on carbon catalyst (1.3 g). The mixture was hydrogenated at 40 psi until hydrogen uptake ceased after about 3 hours. The mixture was filtered through celite (a tradename for diatamaceous earth) to remove the palladium catalyst, and chromatographed over silica gel (hexane-ether); 25.1 g (94% yield) of the title product was obtained
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