Trifluoroacetic acid → 5-(L-methionyloxy)-7-chloro-1-[2-methoxy-4-(2-methylbenzoylamino)benzoyl]-2,3,4,5-tetrahydro-1H-benzazepine

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A uniform solution of 1.27 g of 5-(N-tert-butoxycarbonyl-L-methionyloxy)-7-chloro-1-[2-methoxy-4-(2-methylbenzoylamino)benzoyl]-2,3,4,5-tetrahydro-1H-benzo-azepine, 2.5 ml of trifluoroacetic acid and 0.6 ml of anisole was stirred at room temperature for 2 hours. The most part of trifluoroacetic acid was removed by distillation under reduced pressure. To the residue was added a 0.2N aqueous sodium hydroxide solution to make the residue alkaline. The mixture was subjected to extraction with dichloromethane. The dichloromethane layer was water-washed, then dried over magnesium sulfate and concentrated. The residue was purified by silica gel column chromatography (elutant: ethyl acetate) to obtain 0.34 g of an isomer A and 0.35 g of an isomer B both of 5-(L-methionyloxy)-7-chloro-1-[2-methoxy-4-(2-methylbenzoylamino)benzoyl]-2,3,4,5-tetrahydro-1H-benzoazepine.

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