Sodium Hydroxide → 5-Bromo-2-[2-fluoro-4-(methylsulfonyl)phenyl]benzo[d]oxazole

Participants

Reaction Conditions

Reaction Steps

2-Amino-4-bromophenol (1.77 g, 9.4 mmol) and 2-fluoro-4-(methylsulfonyl)benzoic acid (2 g, 9.4 mmol) were dissolved in polyposphoric acid (60 g). This mixture was heated at 195° C. for three and half hours. Reaction mixture cooled to rt and diluted with ice water (100 ml). Aqueous layer basified with sodium hydroxide pellets to pH 9. Work up (EtOAc/H2O) followed by evaporation of EtOAc afforded the crude. Crude was purified on combiflash with a gradient mixture of EtOAc and Petether (33:67) to obtain the titled compound (2.8 g) as an off-white solid.

Provenance & Evidence