Lithium Hydroxide → 1-(4-Bromo-6-fluoro-1H-benzoimidazol-2-yl)-1H-pyrazole-4-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

A mixture of 1-(4-bromo-6-fluoro-1H-benzoimidazol-2-yl)-1H-pyrazole-4-carboxylic acid ethyl ester (16.0 mg, 45.0 mmol), LiOH (10.0 mg, 0.230 mmol), THF (0.5 mL), and H2O (0.17 mL) was stirred at 23° C. for 16 h. THF was removed under reduced pressure and then aqueous HCl was added. The resulting precipitate was collected and washed with water to yield the titled compound (10.0 mg, 67%). MS (ESI/CI): mass calcd. for C11H6BrFN4O2, 325.1; m/z found, 326.0 [M+H]+. 1H NMR (400 MHz, DMSO-d6): 13.82 (s, 1H), 12.94 (s, 1H), 8.87 (s, 1H), 8.30 (d, J=0.5 Hz, 1H), 7.45 (dd, J=9.6, 2.3 Hz, 1H), 7.32 (s, 1H).

Provenance & Evidence