3-Amino-2,3,4,5-tetrahydro-2-oxo-1H-1-benzazepin-1-t-butyl acetate → tert-butyl 3(R)-[5-(1-benzyloxycarbonyl-4-piperidyl)-1(S)-ethoxycarbonylpentyl]amino-2-oxo-2,3,4,5-tetrahydro-1H-1-benzazepine-1-acetate

Participants

Reaction Conditions

Reaction Steps

A mixture of 0.32 g of tert-butyl (RS)-3-amino-2-oxo-2,3,4,5-tetrahydro-1H-1-benzazepine-1-acetate and 0.2 g of ethyl (R)-(1-benzyloxycarbonyl-4-piperidyl)-2-methanesulfonylhexanoate is heated at 90° C. for 30 minutes. After cooled, the mixture is separated and purified by silicagel column chromatography (hexane:ethyl acetate=2:1) to give 0.14 g of tert-butyl 3(R)-[5-(1-benzyloxycarbonyl-4-piperidyl)-1(S)-ethoxycarbonylpentyl]amino-2-oxo-2,3,4,5-tetrahydro-1H-1-benzazepine-1-acetate as colorless oil from the first fraction.

Provenance & Evidence