[NH2:1][CH2:2][C@@H:3]1[O:9][CH2:8][CH2:7][N:6]([C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])[CH2:5][C@H:4]1[C:17]1[CH:22]=[CH:21][C:20]([Cl:23])=[C:19]([Cl:24])[CH:18]=1.C(N(CC)CC)C.C([O:35][CH2:36][C:37](Cl)=[O:38])(=O)C.O>C1COCC1>[Cl:24][C:19]1[CH:18]=[C:17]([C@H:4]2[C@H:3]([CH2:2][NH:1][C:36](=[O:35])[CH2:37][OH:38])[O:9][CH2:8][CH2:7][N:6]([C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])[CH2:5]2)[CH:22]=[CH:21][C:20]=1[Cl:23]To a solution of tert-butyl (6R,7R)-7-(aminomethyl)-6-(3,4-dichlorophenyl)-1,4-oxazepane-4-carboxylate (170 mg) and triethylamine (0.126 mL) in THF (4.0 ml) was added acetoxyacetyl chloride (93 mg), and the mixture was stirred at room temperature overnight. To the reaction solution was added water, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. To a solution of the obtained residue in methanol (4.0 mL) was added potassium carbonate (273 mg), and the mixture was stirred at room temperature for 3 hr. The reaction solution was concentrated under reduced pressure, the residue was poured into water, and the mixture was extracted with ethyl acetate. The extract was washed with water and brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel chromatography (hexane/ethyl acetate) to give the title compound (183 mg).
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