Trifluoroacetic acid → HCID 178480562, compound

Participants

Reaction Steps

610 mg of (2S, 4S)-4-(4-methoxybenzylthio)-1-methyl-2-[3-(N-4-nitrobenzyloxycarbonylacetimidoylamino)azetidin-1-ylcarbonyl]pyrrolidine [prepared as described in step (a) above] were dissolved in 1.19 ml of anisole, and 4.23 ml of trifluoroacetic acid and 193 μl of trifluoromethanesulfonic acid were added to the resulting solution, whilst ice-cooling. The mixture was then stirred for 1 hour under the same conditions and then at room temperature for a further 1 hour. At the end of this time, the solvent was removed by distillation under reduced pressure, and the resulting residue was washed with hexane and with diethyl ether and dried by evaporation under reduced pressure, to convert it to the trifluoromethanesulfonate in the form of a powder. Ethyl acetate was added to the whole of this compound, followed by sufficient of a saturated aqueous solution of sodium hydrogencarbonate to make it alkaline. The ethyl acetate layer was separated, washed with an aqueous solution of sodium chloride and dried over anhydrous magnesium sulfate, and the solvent was removed by evaporation under reduced pressure, to give 448 mg of the title compound as a powder.

Provenance & Evidence