Trifluoroacetic acid → HCID 57947407, compound

Participants

Reaction Steps

To a solution of {(S)-2-(tert-Butoxycarbonyl-methyl-amino)-3-[3-(3-fluoro-phenyl)-isoxazol-5-ylcarbamoyloxy]-propyl}-(2,2-difluoro-ethyl)-carbamic acid tert-butyl ester (291 mg, 0.62 mmol) in DCM (5 mL) was added TFA (1.0 mL). The mixture was stirred at RT for 1 h, concentrated, and dissolved in THF (10 mL). To the resulting solution were added 4-nitrophenyl 2-chloro-3-fluorobenzylcarbamate (220 mg, 0.68 mmol) and TEA (0.3 mL, 1.24 mmol) at 0° C. The resulting mixture was stirred at 0° C. for 1 h. The solvent was removed and the resulting residue was purified on RP-HPLC using a mixture of acetonitrile and water to give (S)-2-(3-(2-chloro-3-fluorobenzyl)-1-methylureido)-3-(2,2-difluoroethylamino)propyl 3-(3-fluorophenyl)isoxazol-5-ylcarbamate (135 mg, 39% for two steps) as white solid. LRMS (M+H+) m/z 559.2.

Provenance & Evidence