Hydrogen Peroxide → N-(4-bromo-3-chlorophenyl)-7-chlorobenzo[d]oxazol-2-amine

Participants

Reaction Steps

An ambient solution of 2-amino-6-chlorophenol (0.86 g, 6.0 mmol) and 3-chloro-4-bromophenyl isothiocyanate (1.49 g, 6.0 mmol) in tetrahydrofuran (20 mL) was stirred for 16 h. The reaction was cooled (0° C.), and LiOH.H2O (0.521 g, 12.41 mmol) was added, followed by the drop wise addition of 30% H2O2 (3.41 mL, 31.0 mmol) over 15 minutes. The reaction was warmed to room temperature and stirred for 16 h. The reaction was then quenched by the addition of 20% aqueous sodium sulfite solution (50 mL) and ethyl acetate (75 mL). The layers were separated, and the aqueous was extracted with additional ethyl acetate (2×75 mL). The combined organics were dried with anhydrous Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by chromatography on SiO2 gel, eluting with 25% ethyl acetate in hexane, to give the title compound. MS (ESI) m/z 359[M+H]+.

Provenance & Evidence