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A mixture of 98 (600 mg, 2.93 mmol) in formic acid (5.0 mL) was heated to reflux overnight. The reaction mixture was concentrated in vacuo to afford a brown oil that was partitioned between EtOAc (300 mL) and a sat'd. aq. NaHCO3 (100 mL). The organic layer was separated, dried (MgSO4), filtered and evaporated in vacuo to afford 550 mg (87%) of 5-bromo-6-fluoro-1H-benzo[d]imidazole (100) as white solid (550 mg, 87%): MS (ESI) m/z=215 [M+1]+.

1. temperaturewas heated
2. temperatureto reflux overnight
3. concentrationThe reaction mixture was concentrated in vacuo
4. customto afford a brown oil that
5. customwas partitioned between EtOAc (300 mL)
6. customThe organic layer was separated
7. dry with materialdried (MgSO4)
8. filtrationfiltered
9. customevaporated in vacuo