Dimethylformamide → 8-[4-(2-butoxyethoxy)phenyl]-1-propyl-N-[4-[(N-methyl-N-(tetrahydropyran-4-yl)amino]methyl)phenyl]-1,2,3,4-tetrahydro-1-benzazocine-5-carboxamide

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Reaction Steps

To a solution of 8-[4-(2-butoxyethoxy)phenyl]-1-propyl-1,2,3,4-tetrahydro-1-benzazocine-5-carboxylic acid (180 mg) in THF (10 ml) were added a drop of DMF and then thionylchloride (0.04 ml) at 0° C. After stirring at room temperature for 30 minutes under a nitrogen atmosphere, the mixture was added to a solution of 4-[[N-methyl-N-(tetrahydropyran-4-yl)amino]methyl]aniline (118 mg), and triethylamine (1.08 g) in tetrahydrofuran (15 ml) at 0° C. After stirring at room temperature for 1.5 hours under a nitrogen atmosphere, water was added and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated salt solutions, and dried over magnesium sulfate. After distilling off the solvent under reduced pressure, the residue was separated and purified by silica gel column chromatography (ethyl acetate:methanol=8:1) to obtain yellowish amorphous 8-[4-(2-butoxyethoxy)phenyl]-1-propyl-N-[4-[(N-methyl-N-(tetrahydropyran-4-yl)amino]methyl)phenyl]-1,2,3,4-tetrahydro-1-benzazocine-5-carboxamide (Compound 2, 64 mg).

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