Ethyl alpha-oxobenzenebutanoate → HCID 70393826, compound

Participants

Reaction Steps

A solution of 1.15 g of tert.butyl 8(S)-amino-2,3,6,7,8,9-hexahydro-5,9-dioxo-1H,5H-pyrazolo[1,2-a][1,2]diazepine-1(S)-carboxylate and 3.10 g of ethyl 2-oxo-4-phenylbutanoate in 50 ml of ethanol was hydrogenated over 1.0 g of 10% palladium-on-carbon in the presence of molecular sieve at 4 atmospheres for 48 hours. The catalyst was removed by filtration and the filtrate was evaporated. The residue was chromatographed on silica gel to give 0.18 g of tert.butyl 8(S)-[1(R)-ethoxycarbonyl-3-phenylpropylamino]-2,3,6,7,8,9-hexahydro-5,9-dioxo-1H,5H-pyrazolo[1,2-a][1,2]diazepine-1(S)-carboxylate in the form of a pale yellow oil and subsequently 0.19 g of tert.butyl 8(S)-[1(S)-ethoxycarbonyl-3-phenylpropylamino]-2,3,6,7,8,9-hexahydro-5,9-dioxo-1H,5H-pyrazolo[1,2-a][1,2]diazepine-1(S)-carboxylate in the form of a pale yellow oil.

Provenance & Evidence