Pyrazine → 4-((2,6-difluorophenyl)(hydroxy)(pyrazin-2-yl)methyl)-6-(3,5-dimethylisoxazol-4-yl)-1H-benzo[d]imidazol-2(3H)-one

Participants

Reaction Conditions

Reaction Steps

n-BuLi (0.21 mL, 0.33 mmol) was added dropwise to a solution of 2,2,6,6-tetramethylpiperidine (0.06 mL, 0.33 mmol) in THF (0.7 mL) at 0° C. and was allowed to stir for 5 minutes. Pyrazine (24 mg, 0.3 mmol) in THF (0.4 mL) was added and the reaction was stirred for an additional 5 minutes and then cooled to −78° C. tert-butyl 4-(2,6-difluorobenzoyl)-6-(3,5-dimethylisoxazol-4-yl)-2-ethoxy-1H-benzo[d]imidazole-1-carboxylate (50 mg, 0.10 mmol) in THF (0.4 mL) was added, the solution was allowed to stir for 5 minutes and then quenched with water. Solution was extracted three times with EtOAc, washed once with brine and concentrated. Crude was purified by reverse-phase HPLC and then taken up in EtOH (3 mL) and HCl (0.1 mL) and heated to 65° C. for 2 hours. Reaction was cooled and concentrated to afford desired product as a pale brown powder.

Provenance & Evidence