Triethylamine → (2S,4R)-4-Methanesulfonyloxy-2-{4-[2-(4-nitrobenzyloxycarbonyl)oxyethyl]-1-piperazinylcarbonyl}-1-(4-nitrobenzyloxycarbonyl)pyrrolidine

Participants

Reaction Steps

89 μl of triethylamine and 50 μl of methanesulfonyl chloride were added, whilst ice-cooling, to a solution of 321 mg of (2S,4R)-4-hydroxy-2-{4-[2-(4-nitrobenzyloxycarbonyl)oxyethyl]-1-piperazinyl carbonyl}-1-(4-nitrobenzyloxycarbonyl)pyrrolidine in 3.2 ml of dry tetrahydrofuran, and the resulting mixture was stirred at between 0° C. and 5° C. for 30 minutes and then at room temperature for a further 1 hour. At the end of this time, the reaction mixture was concentrated by evaporation under reduced pressure, and the resulting residue was mixed with an aqueous solution of sodium hydrogencarbonate; the mixture was then extracted with ethyl acetate. The extract was washed with an aqueous solution of sodium chloride and dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure, to give 345 mg of the title compound as a powder.

Provenance & Evidence