1-Hydroxybenzotriazole → (S)-3-(4-Benzyloxybenzenesulfonylamino)-N-hydroxy-2-(4-methanesulfonyl-piperazin-1-yl)propionamide

Participants

Reaction Steps

224 mg (1.7 mmol) of 1-hydroxybenzotriazole and 318 mg (1.7 mmol) of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride are added successively to 750 mg (1.5 mmol) of (S)-3-(4-benzyloxybenzenesulfonylamino)-2-(4-methanesulfonylpiperazin-1-yl)propanoic acid in 20 ml of dimethylformamide. After stirring at ambient temperature for 20 min, a solution of 244 mg (1.7 mmol) of O-tert-butyldimethylsilylhydroxylamine in 3 ml of dimethylformamide is added. The reaction medium is then stirred at ambient temperature for 18 h and then 2 ml of a saturated aqueous solution of sodium hydrogen carbonate and finally 2 ml of water are added. After extraction with ethyl acetate, the organic phase is washed with a saturated aqueous solution of sodium hydrogen carbonate, dried over magnesium sulfate, filtered and concentrated. The crude residue obtained is taken up in 15 ml of ethyl acetate, heated to 70° C. and then brought back to ambient temperature, filtered and dried under vacuum.

Provenance & Evidence