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7-[4-(2-butoxyethoxy)phenyl]-1-propyl-N-[4-[(2-pyridinylsulfanyl)methyl]phenyl]-2,3-dihydro-1-benzazepine-4-carboxamide (0.30 g) was dissolved in methylene chloride (15 ml), m-chloroperbenzoic acid (83 mg) was added to the solution at −30° C., and the mixture was stirred for 1 hour at 0° C. The reaction mixture was added to an aqueous solution of saturated sodium thiosulfate, and extracted with ethyl acetate. The organic layer washed with saturated brine, and dried over magnesium sulfate. The solvent was removed under reduced pressure, and the obtained residue was purified by silica gel column chromatography, to give 7-[4-(2-butoxyethoxy)phenyl]-1-propyl-N-[4-[(2-pyridinylsulfinyl)methyl]phenyl]-2,3-dihydro-1-benzazepine-4-carboxamide (Compound 181) (97 mg).

1. extractionextracted with ethyl acetate
2. washThe organic layer washed with saturated brine
3. dry with materialdried over magnesium sulfate
4. customThe solvent was removed under reduced pressure
5. customthe obtained residue was purified by silica gel column chromatography