Hydrochloric Acid → HCID 20429045, compound

Participants

Reaction Steps

To a solution of 7-phenoxyacetamido-8-oxo-3-trifluoromethanesulfonyl-5-thia-1,3-diazabicyclo[4,2,0]octane-2-carboxylic acid (547 mg.) in N,N-dimethylformamide (4 ml.) were added triethylamine (160 μl) and 4-nitrobenzyl bromide (276 mg.) at 0° C., and the mixture was stirred at room temperature for 18.5 hours. The reaction mixture was poured into a chilled dilute hydrochloric acid and then extracted with ethyl acetate (50 ml.). The extract was washed with water (×3), a dilute aqueous solution of sodium bicarbonate (×2), water and an aqueous solution of sodium chloride, successively. Drying over magnesium sulfate and removal of the solvent gave a residue (610 mg.), which was chromatographed on silica gel (9.5 g.) with a mixed solvent of benzene and ethyl acetate (10:1 to 5:1 by volume) to give an amorphous solid (328 mg.) of 4-nitrobenzyl 7-phenoxyacetamido-8-oxo-3-trifluoromethanesulfonyl-5-thia-1,3-diazabicyclo[4,2,0]octane-2-carboxylate.

Provenance & Evidence