Hydrochloric Acid → 1-methyl-5-[4'-(trifluoromethyl)[1,1'-biphenyl]-2-carboxamido]-1H-indole-2-carboxylic acid hydrate

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Reaction Steps

1-methyl-5-[4′-(trifluoromethyl)[1,1′-biphenyl]-2-carboxamido]-1H-indole-2-carboxylic acid sodium salt hydrate (0.62 g), from the previous alternative, and aqueous hydrochloric acid (2 molar) were combined in refluxing ethanol (13 mL) and water (1.3 mL). The mixture was cooled, granulating overnight, chilled in ice and the resulting slurry was filtered. The product solids were dried, yielding the title compound, 1-methyl-5-[4′-(trifluoromethyl)[1,1′-biphenyl]-2-carboxamido]-1H-indole-2-carboxylic acid hydrate (0.5 g, 83%, containing 2% water by weight). Anhydrous Mol wt (calc) 438.41, MS: 439.35 (MH+), 437.20 (M−). 1H NMR (DMSO-d6): δ 3.97 (s, 3H), 7.13 (s, 1H), 7.30-7.75 (complex, 10H), 7.92 (s, 1H), 10.21 (s, 1H). HPLC retention time 9.29 minutes.

Provenance & Evidence