N,N-bis(4-methoxyphenyl)-2-oxopropanamide → 2-hydroxy-N,N,2-tris(4-methoxyphenyl)propanamide

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N,N-bis(4-methoxyphenyl)-2-oxopropanamide (0.53 g, 1.77 mmol) was placed in a 250 mL three-necked round-bottomed flask fitted with a stirring bar, a rubber stopper and a nitrogen inlet, and dissolved in 30 mL anhydrous THF. The solution was cooled to −78° C. in dry ice-acetone bath. 4-Methoxyphenylmagnesium bromide solution (3.89 mL of 0.5 M THF solution, 7.25 mmol) was added dropwise with stirring at −78° C. under nitrogen atmosphere. The resulted solution was stirred at −78° C. for one hour and then at room temperature for one hour. The reaction was quenched by adding 20 mL of saturated NH4Cl solution. EtOAc (3×30 mL) was added to extract the solution. The organic layers were separated, washed with brine (20 mL) and dried over anhydrous MgSO4. The solvent was removed under reduced pressure and the residue was purified by flash column chromatography (silica gel, EtOAc/hexanes=1/1 v/v) to give a white solid product, 2-hydroxy-N,N,2-tris(4-methoxyphenyl)propanamide, 0.61 g, 84.7% yield.

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