Hydrochloric Acid → Diphenylmethyl [4-[3-(4-cyanobenzenesulfonylamino)propyl]-2,3-dioxopiperazin-1-yl]acetate

Participants

Reaction Steps

In 7 ml of tetrahydrofuran was dissolved 0.70 g of diphenylmethyl [4-(3-aminopropyl)-2,3-dioxopiperazin-1-yl]acetate hydrochloride, and 0.36 g of 4-cyanobenzenesulfonyl chloride and then 0.58 ml of triethylamine were added thereto under ice-cooling. After stirring at room temperature for 30 minutes, the reaction mixture was added to a mixed solvent of 20 ml of ethyl acetate and 20 ml of water and the pH was adjusted to 3 with 2N hydrochloric acid. The organic layer was separated, washed with water and then a saturated aqueous sodium chloride solution, and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the resulting residue was purified by a silica gel column chromatography (eluent; chloroform:methanol=20:1) to obtain 0.43 g of diphenylmethyl [4-[3-(4-cyanobenzenesulfonylamino)propyl]-2,3-dioxopiperazin-1-yl]acetate as a yellow foamy substance.

Provenance & Evidence