2-Methyl-N-[4-[(2,3,4,5-tetrahydro-5-oxo-1H-1-benzazepin-1-yl)carbonyl]phenyl]benzamide → 5-methyl-5-hydroxy-1-[4-(2-methylbenzoylamino)benzoyl]-2,3,4,5-tetrahydro-1H-benzazepine

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Reaction Steps

5-Oxo-1-[4-(2-methylbenzoylamino)benzoyl]-2,3,4,5-tetrahydro-1H-benzazepine (0.50 g) is suspended in tetrahydrofuran (20 ml), and thereto is added dropwise a 3.0 M solution of methyl magnesium bromide in diethyl ether (1.5 ml) at room temperature. The mixture is stirred at room temperature for 1 hour. The reaction solution is poured into ice-water (20 ml), and extracted with ethyl acetate. The extract is dried over magnesium sulfate, and the solvent is distilled off. The resulting residue is purified by silica gel column chromatography (eluent; ethyl acetate:n-hexane=2:3→1:1), and recrystallized from ethyl acetate/n-hexane to give 5-methyl-5-hydroxy-1-[4-(2-methylbenzoylamino)benzoyl]-2,3,4,5-tetrahydro-1H-benzazepine (0.23 g) as white powder, m.p. 204-205° C.

Provenance & Evidence