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Bromo-phenyl-acetyl chloride (191.0 mmol) was taken up in anhydrous dichloromethane (150 mL) and the resulting mixture was cooled to 0° C. in an ice bath. Diethylamine (14.1 g, 191 mmol) was then added drop-wise over 15 minutes, following which DIPEA (24.7 g, 191 mmol) was added over 5 minutes. The reaction mixture was stirred at ambient temperature for 4 h. The reaction mixture was then washed with water, dried over MgSO4, filtered and concentrated to yield a dark brown colored oil. The oil was purified by silica gel chromatography to yield the title compound as a yellow oil.

1. additionwas added over 5 minutes
2. washThe reaction mixture was then washed with water
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated
6. customto yield a dark brown colored oil
7. customThe oil was purified by silica gel chromatography