FC(F)(F)C(O)=O.[O:8]=[C:9]1[C:17]2[C:12](=[CH:13][CH:14]=[C:15]([C:18]([NH:20][CH2:21][C@H:22]([NH:26][S:27]([C:30]3[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=3)(=[O:29])=[O:28])[C:23]([OH:25])=[O:24])=[O:19])[CH:16]=2)[CH2:11][N:10]1[CH2:36][CH2:37][NH:38][C:39]1[N:44]=[CH:43][CH:42]=[CH:41][N:40]=1>[Pd].CC(O)=O>[O:8]=[C:9]1[C:17]2[C:12](=[CH:13][CH:14]=[C:15]([C:18]([NH:20][CH2:21][C@H:22]([NH:26][S:27]([C:30]3[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=3)(=[O:29])=[O:28])[C:23]([OH:25])=[O:24])=[O:19])[CH:16]=2)[CH2:11][N:10]1[CH2:36][CH2:37][NH:38][C:39]1[NH:44][CH2:43][CH2:42][CH2:41][N:40]=110% Pd/C (101 mg) was added to HOAc/12 0 N HCl solution (19:1, 31 ml) containing 6-6 (649 mg, 1.01 mmol) and the mixture hydrogenated at 60 PSI for 2.5 hr. Filtration and concentration gave a gum which was purified by flash chromatography (silica, 7:1.5:1.5 EtOH/NH4OH/H2O) to provide 6-7 as a colorless solid.
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