Benzenesulfonyl chloride → N-benzenesulfonylglycyl-L-proline benzylester

Beteiligte Stoffe

Reaktionsschritte

Glycyl-L-proline benzylester hydrochloride (1.49 g, 5 mmole) was dissolved in methylene chloride (30 ml), and triethylamine (1.11 g, 11 mmole) was added thereto at -30° C., and then methylene chloride (10 ml) solution of benzenesulfonylchloride (0.86 g, 5 mmole) was added dropwise. The mixture was stirred for 1 hour at less than 0° C, and then for 5 hours at room temperature, and methylene chloride (60 ml) was added. The mixture thus obtained was washed with 5% aqueous sodium bicarbonate (100 ml, twice), 1N aqueous hydrochloric acid (100 ml, twice) and water (100 ml) in the order given, and dried over anhydrous magnesium sulfate. The solvent was distilled under reduced pressure to give N-benzenesulfonylglycyl-L-proline benzylester (yield: 1.91 g, 94.9%).

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