5,5-Dimethyl-1-(2-methylphenyl)piperazin-2-one → N-{(S)-2-[2,2-Dimethyl-4-(2-methylphenyl)-5-oxopiperazin-1-yl]-1-[(2S,4R)-4-ethyl-5-oxotetrahydrofuran-2-yl]ethyl}-2-nitrobenzenesulfonamide

Participants

Reaction Steps

A solution of 770 mg of (3R,5S)-3-ethyl-5-[(S)-1-(2-nitrobenzenesulfonyl)aziridin-2-yl]dihydrofuran-2-one obtained in Example (106g) (2.26 mmol) and 593 mg of 5,5-dimethyl-1-(2-methylphenyl)piperazin-2-one obtained in Example (51d) (2.71 mmol) in toluene (23 ml) was stirred at 110° C. for five hours. After cooling, the reaction mixture was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (elution solvent:methylene chloride/ethyl acetate=4/1) to obtain 1.22 g of the title compound (yield: 97%).

Provenance & Evidence