4-Azido-5-bromo-2-(2,4-dichlorophenylamino)-3-fluorobenzoic acid methyl ester → 4-Amino-5-bromo-2-(2,4-dichlorophenylamino)-3-fluorobenzoic acid methyl ester

Participants

Reaction Steps

To a mixture of 4-azido-5-bromo-2-(2,4-dichlorophenylamino)-3-fluorobenzoic acid methyl ester (2.05 g, 4.72 mmol) in AcOH-CH2Cl2 (10-30 mL) was added Zn dust (1.59 g, 24.3 mmol) at 0° C. The reaction mixture was warmed to room temperature. The resulting mixture was stirred for 1 hour. The reaction mixture was diluted with CH2Cl2, and washed with water, saturated aqueous NaHCO3 (2×), water, and brine. The organic layer was dried over MgSO4, filtered, and concentrated in vacuo to give the crude material which was purified by silica gel flash column chromatography(3 to 5% EtOAc in hexanes) to afford the desired product (1.24 g, 64%).

Provenance & Evidence