Boron tribromide dichloromethane → 5-(4-Hydroxyphenyl)-1,5,8,9,10,11-hexahydronaphtho[1,2-b][1,4]diazepine-2,4-dione

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Reaction Steps

5-(4-Methoxyphenyl)-1,5,8,9,10,11-hexahydronaphtho[1,2-b][1,4]diazepine-2,4-dione (200 mg, 0.59 mmol) obtained in Example 13 was dissolved in dry dichloromethane (5 mL) while stirring in ice-bath. To the solution was dropwise added 1M boron tribromide-dichloromethane (1.2 mL). The mixture was stirred at room temperature for 16 hours and at 50° C. for 3 hours. The solvent was removed by evaporation under reduced pressure. To the residue was added cold water. The mixture was extracted with ethyl acetate, washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was removed by evaporation under reduced pressure. The residue was purified by silica gel column chromatography (chloroform/methanol=100/1) to give the titled compound as a white amorphous form (124 mg, yield 64%).

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