[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][C:11]([F:17])([C:14]([OH:16])=O)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].C(N1C=CN=C1)(N1C=CN=C1)=O.Cl.[CH3:31][NH:32][O:33][CH3:34].O>ClCCl.C(OCC)(=O)C>[CH3:34][O:33][N:32]([CH3:31])[C:14]([C:11]1([F:17])[CH2:10][CH2:9][N:8]([C:6]([O:5][C:1]([CH3:2])([CH3:3])[CH3:4])=[O:7])[CH2:13][CH2:12]1)=[O:16]
After dissolving 2.19 g of 1-(tert-butoxycarbonyl)-4-fluoropiperidine-4-carboxylic acid in 30 ml of dichloromethane, 2.16 g of 1,1′-carbonyldimidazole was added and the mixture was stirred at room temperature for 1.5 hours. Next, 1.30 g of N-methyl-O-methylhydroxylamine hydrochloride was added and the mixture was stirred overnight at room temperature. Water was added to the reaction solution, and extraction was performed with ethyl acetate. The organic layer was washed with aqueous sodium carbonate solution, water and saturated brine in that order and dried over anhydrous magnesium sulfate, and then the solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (solvent: n-hexane/ethyl acetate) to obtain the title compound (2.33 g, 90% yield).
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