Trifluoroacetic acid → HCID 178426944, compound

Participants

Reaction Conditions

Reaction Steps

A dry 100 mL round bottom flask equipped with an Ar(g) inlet was charged with {4-[(6-{3-[(2,5-Dimethyl-2H-pyrazole-3-carbonyl)-amino]-benzoyl}-2-oxo-1,2-dihydro-indol-3-ylidenemethyl)-amino]-benzyl}-carbamic acid tert-butyl ester (as prepared in Example 203, 0.113 g, 0.186 mmol) and CH2Cl2 (0.622 mL). The resulting solution was cooled to 0° C. in an ice bath. TFA (0.015 mL) was then added and the reaction mixture was allowed to stir at 0° C. for 30 minutes after which the bath was removed and the reaction was allowed to stir at room temperature for an additional 1 h. Subsequently the reaction mixture was neutralized with saturated NaHCO3(aq) and then washed with EtOAc (3×20 mL). The combined organic layer was then dried over anhydrous Na2SO4, filtered and concentrated in vacuo. The crude residue was chromatographed over silica (5% MeOH/95% CHCl3) to afford pure 2,5-Dimethyl-2H-pyrazole-3-carboxylic acid (3-{3-[(4-aminomethyl-phenylamino)-methylene]-2-oxo-2,3-dihydro-1H-indole-6-carbonyl}-phenyl)-amide in 61% yield (0.057 g, 0.113 mmol).

Provenance & Evidence