CC(OI1(OC(C)=O)(OC(C)=O)OC(=O)C2C=CC=CC1=2)=O.[Cl:23][C:24]1[CH:25]=[C:26]([CH:31]2[O:37][CH2:36][CH2:35][N:34]([C:38]([O:40][C:41]([CH3:44])([CH3:43])[CH3:42])=[O:39])[CH2:33][CH:32]2[OH:45])[CH:27]=[CH:28][C:29]=1[Cl:30].C(=O)([O-])O.[Na+].S([O-])([O-])=O.[Na+].[Na+]>C(#N)C>[Cl:23][C:24]1[CH:25]=[C:26]([CH:31]2[O:37][CH2:36][CH2:35][N:34]([C:38]([O:40][C:41]([CH3:43])([CH3:42])[CH3:44])=[O:39])[CH2:33][C:32]2=[O:45])[CH:27]=[CH:28][C:29]=1[Cl:30]Dess-Martin reagent (1.4 g) was added to a solution of tert-butyl (6RS,7SR)-7-(3,4-dichlorophenyl)-6-hydroxy-1,4-oxazepane-4-carboxylate (800 mg) in acetonitrile (10 ml), and the mixture was stirred at 0° C. for 1 hr. To the reaction mixture were added saturated aqueous sodium hydrogen carbonate and aqueous sodium sulfite solution, and the mixture was extracted with ethyl acetate. The extract was washed with brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography to give the title compound (624 mg).
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