0.15 g of 4-bromo-2-chlorophenol, 0.18 g of sodium hydrogen carbonate, 0.6 mL of ethanol, 0.3 mL of water and 42 mg of tetrakis(triphenylphosphine) palladium(0) were added to 2.1 mL of toluene solution containing 0.37 g of tert-butyl 2-(benzamido)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoate at room temperature, and the resulting mixture was heated to reflux for 4 hours. Toluene and a saturated sodium hydrogen carbonate aqueous solution were added after the reaction mixture was cooled to room temperature. The organic layer was separated and ethyl acetate was added after washed with a saturated sodium chloride aqueous solution and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. Hexane was added to the obtained residue and a solid substance was separated by filtration to obtain tert-butyl 2-(benzamido)-4-(3-chloro-4-hydroxyphenyl)benzoate.
