Water → 1-Ethyl-7-hydroxy-3,3,5-trimethyl-1,5-dihydrobenzo[b][1,4]diazepine-2,4-dione

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Reaktionsschritte

A 1.0 M boron tribromide/dichloromethane solution (1.22 ml) was added to a dichloromethane solution (3 ml) of 1-ethyl-7-methoxy-3,3,5-trimethyl-1,5-dihydrobenzo[b][1,4]diazepine-2,4-dione (169 mg, 1.0 mmol) at 0° C., and stirred at room temperature overnight. Water and methanol were added to the reaction mixture and extraction with the mixture solvent (dichloromethane:methanol=10:1) was performed. The organic layer was dried over anhydrous sodium sulfate, and concentrated to dryness under reduced pressure to thereby obtain 156.4 mg (yield: 98%) of 1-ethyl-7-hydroxy-3,3,5-trimethyl-1,5-dihydrobenzo[b][1,4]diazepine-2,4-dione as a white powder.

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