[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:9]=[CH:10][C:11]3[O:17][CH2:16][CH2:15][C:14]([C:18](O)=[O:19])=[CH:13][C:12]=3[CH:21]=2)=[CH:4][CH:3]=1.O[N:23]1C2C=CC=CC=2N=N1.C(OC(N1CCC(CN)CC1)=O)(C)(C)C.Cl.CN(C)CCCN=C=NCC>CN(C=O)C>[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:9]=[CH:10][C:11]3[O:17][CH2:16][CH2:15][C:14]([C:18]([NH2:23])=[O:19])=[CH:13][C:12]=3[CH:21]=2)=[CH:4][CH:3]=1To 7-(4-methylphenyl)-2,3-dihydro-1-benzooxepine-4-carboxylic acid (1402 mg, 5.00 mmol) dissolved in DMF (30 ml) were added at 0° C. 1-hydroxybenzotriazole (743 mg, 5.50 mmol), [1-(tert-butoxycarbonyl)piperidin-4-yl]methylamine (1393 mg, 6.50 mmol) and 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (1438 mg, 7.50 mmol), and the resulting mixture was stirred at room temperature for 61 hours. The reaction mixture was concentrated under reduced pressure, ethyl acetate (100 ml) was added to the residue, and the resulting mixture was washed successively with water (10 ml×3), a 10% aqueous solution of potassium hydrogensulfate (10 ml×3), an aqueous saturated solution of sodium bicarbonate (10 ml×3) and an aqueous saturated solution of sodium chloride (10 ml). The organic layer was dried with anhydrous magnesium sulfate and then was concentrated under reduced pressure, and the residue was subjected to column chromatography (silica gel 80 g, ethyl acetate/hexane 1/2→1/1). The objective fractions were concentrated under reduced pressure to obtain N-[1-(tert-butoxycarbonyl)piperidin-4-yl]methyl]-7-(4-methylphenyl)-2,3-dihydro-1-benzooxepine-4-carboxamide (2409 mg).
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