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Analogously to the procedure described in H. Y. Choi et al., Org. Lett. 5 (2003), 411, a solution of bromine (8.46 g, 52.95 mmol) in acetic acid (12 ml) was added at 0° C. to a solution of 1-(3-fluoro-2-methyl-phenyl)-propan-2-one (4.00 g, 24.07 mmol) in acetic acid (4 ml) and a 33% solution of hydrogen bromide in acetic acid (4 ml). The mixture was warmed to room temperature and stirred for 12 h. Then acetone was added and the mixture was stirred for 24 h. After evaporation under reduced pressure, the residue was extracted several times with DCM. The combined extracts were dried over sodium sulfate and evaporated to dryness. The residue was purified by preparative HPLC to give 4.10 g of the title compound as an oil.

1. stirringthe mixture was stirred for 24 h
2. customAfter evaporation under reduced pressure
3. extractionthe residue was extracted several times with DCM
4. dry with materialThe combined extracts were dried over sodium sulfate
5. customevaporated to dryness
6. customThe residue was purified by preparative HPLC