Acetyl chloride → Methyl 5-acetamido-2-bromobenzoate

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Methyl 5-amino-2-bromobenzoate (Reference Compound No. 1-(1), 21.0 g, 91.2 mmol) and triethylamine (19.0 mL, 137 mmol) were dissolved in anhydrous dichloromethane (450 mL), acetyl chloride (13.0 mL, 182 mmol) was added dropwise over 30 minutes under ice cooling, and then the mixture was stirred at 0° C. for 2 hours. The reaction mixture was washed with water (200 mL, twice), saturated aqueous sodium hydrogen carbonate solution (200 mL, twice), and saturated brine (200 mL) successively, dried over anhydrous magnesium sulfate, and then the solvent was removed under reduced pressure. The obtained residue was filtered with hexane-ethyl acetate (20:1) to give the titled reference compound (24.2 g) as a pale yellow solid. (Yield 98%)

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