Trifluoroacetic acid → 5-Chloro-N-[(5-chloro-2-thienyl)sulfonyl]-N-[4-(methyloxy)-1H-indazol-3-yl]-2-thiophenesulfonamide

Participants

Reaction Steps

To a cooled, ice/water bath, solution of 1,1-dimethylethyl 3-{bis[(5-chloro-2-thienyl)sulfonyl]amino}-4-(methyloxy)-1H-indazole-1-carboxylate (for a preparation see Intermediate 9) (4.17 g, 6.68 mmol) in DCM (20 mL) was added TFA (10.29 mL, 134 mmol) and the solution was stirred at room temperature for 4 hours. The reaction mixture was diluted with DCM (100 mL) and water (50 mL). The organic phase was passed through an hydrophobic frit and the solvent was removed in vacuo to give the product (3.78 g) as a white solid. This was dried in vacuo at 45° C. for 2 days to give the title compound (3.55 g, 100%) as a white solid. LCMS (System A) RT=1.33 min, ES+ve m/z 524/526/528 (M+H)+.

Provenance & Evidence