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

Participants

Reaction Steps

Reaction of 9.5 g of tert-butyl 3(S)-amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate obtained in Example 26 and ethyl 4-cyclohexyl-2-oxobutyrate is carried out under reductive conditions in a manner similar to that described in Example 16, and the product is purified by silica gel column chromatography (hexane:ethyl acetate=5:1). From the first fraction, 2.3 g of tert-butyl 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.

Provenance & Evidence