Ethyl bromoacetate → benzyl 3(S)-ethoxycarbonylmethylamino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate

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Reaktionsschritte

In 10 ml of ethanol is dissolved 0.5 g of benzyl 3(S)-amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate hydrochloride obtained in Example 5, and triethylamine (0.49 g) and ethyl bromoacetate (0.46 g) are added to the solution. After the solution is stirred for 4 days, the solution is dried under reduced pressure. The residue is purified by silica gel column chromatography (hexane:ethyl acetate=4:3) to give 0.28 g of benzyl 3(S)-ethoxycarbonylmethylamino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate as a pale yellow oil.

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