HCID 13243522, compound → HCID 53803015, compound

Participants

Reaction Steps

A solution of 3-(S)-t-butyloxycarbonylamino-1-ethoxycarbonylmethyl-2,3,4,5-tetrahydro-1H[1]-benzazepin-2,5-dione (3.6 g) in acetic acid (50 ml) is hydrogenated for 120 hours at 3 atmospheres pressure using platinum oxide (1.2 g) as catalyst. The catalyst is filtered off and the filtrate evaporated under reduced pressure. The residue is distributed between dichloromethane (200 ml) and saturated aqueous sodium bicarbonate (100 ml). The dichloromethane solution is washed with water (50 ml), dried over sodium sulfate and the solvent removed under reduced pressure. The residue is chromatographed on silica gel eluting with 0-50% ethyl acetate in toluene. The fraction eluting with 50% ethyl acetate in toluene is collected to give 3-(S)-t-butyloxycarbonylamino-1-ethoxycarbonylmethyl-2,3,4,5,5a,6,7,8,9,9a-decahydro-1H-[1]benzazepin-2,5-dione used without further purification for the next synthetic step.

Provenance & Evidence