Acetonitrile → tert-butyl 3(S)-[1(R)-ethoxycarbonyl-9-phthalimidononyl]amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate

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Reaction Conditions

Reaction Steps

A mixture of tert-butyl 3(S)-amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate (1.65 g), ethyl 2-bromo-10-phthalimidodecanoate (2.4 g), acetonitrile (100 ml) and triethylamine (0.75 g) is heated at 80° C. for 4 days. After evaporation of the solvent, ethyl acetate (200 ml) and water (100 ml) are added to the residue. The ethyl acetate layer is dried over anhydrous magnesium sulfate and evaporated in vacuo. The oily residue is chromatographed on silica gel using hexane-ethyl acetate (2:1) as an eluent. Evaporation of the first fraction gives tert-butyl 3(S)-[1(R)-ethoxycarbonyl-9-phthalimidononyl]amino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate (0.45 g) as a colorless oil.

Provenance & Evidence