Trifluoroacetic acid → N-(3-(Aminomethyl)benzyl)-3,5-dichloro-N-((4'-fluorobiphenyl-4-yl)methyl)-2-hydroxybenzenesulfonamide

Participants

Reaction Conditions

Reaction Steps

tert-Butyl 3-[(3,5-dichloro-N-((4′-fluorobiphenyl-4-yl)methyl]-2-hydroxyphenylsulfonamido) methyl)benzylcarbamate (1.0 g, 1.5 mmol, 1 eq) was dissolved in dry DCM, stirred for 10 minutes and cooled to 0° C. Trifluoroacetic acid (3.5 g, 309 mmol 20 eq) was added slowly at 0° C. The reaction mixture was stirred for 10 min and slowly brought to rt. After 4 h, the solvent was evaporated under reduced pressure, and ethyl acetate and 10% aq. NaHCO3 solution were added. The mixture was stirred for 10 minutes and the aqueous mixture was extracted with ethyl acetate. The organic layer was dried with anhydrous Na2SO4 and evaporated under reduced pressure. The crude salt (0.7 g, 82%) was used immediately in the next step. 1H NMR (400 MHz, DMSO-d6) δ 3.52 (s, 2H), 4.44 (s, 2H), 4.46 (s, 2H), 6.9-6.99 (t, 2H), 7.08-7.10 (d, 2H), 7.17-7.20 (m, 4H), 7.22-7.27 (m, 2H), 7.44-7.46 (d, 2H), 7.6-7.65 (t, 2H). MS (ESI): 546.0 (M+H)+.

Provenance & Evidence