Ethyl 4-cyclohexyl-2-oxobutanoate → benzyl 3(S)-[1(R)-ethoxycarbonyl-3-cyclohexylpropyl]amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate

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반응 단계

Benzyl 3(S)-amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate hydrochloride (1.5 g) and ethyl 4-cyclohexyl-2-oxobutyrate (2.63 g) are subjected to reductive alkylation reaction in a manner similar to that described in Example 16, and the product is purified by silica gel column chromatography (hexane:ethal acetate=5:1-4:1). From the first fraction, 0.4 g of benzyl 3(S)-[1(R)-ethoxycarbonyl-3-cyclohexylpropyl]amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate is obtained as a colorless oil.

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