Chloride → 2((2,6-Dinitrophenyl)amino)benzyl bromide

Participants

Reaction Steps

1.8 g (6.2 mmol) of 2-[(2,6-dinitrophenyl)amino]-benzyl alcohol was dissolved in a mixture of 50 ml of dichloromethane with 50 ml of ethyl ether. Under ice-cooling and stirring, 2.2 ml (15.5 mmol) of triethylamine and 0.58 ml (7.4 mmol) of methanesulfonuyl chloride were successively added thereto. After stirring for 30 minutes, the reaction mixture was poured into a saturated aqueous solution of ammonium chloride and extracted with ethyl acetate. After concentrating, the residue was dissolved in 150 ml of acetone. Then 2.7 g (31 mmol) of lithium bromide was. added and the resulting mixture was heated under reflux for 1 hour. After distilling off the solvent under reduced pressure, the residue was purified by silica gel column chromatography to thereby give 0.5 g of 2[(2,6-dinitrophenyl)amino]-benzyl bromide. This product was dissolved in 10 ml of dimethylformamide. After adding 216 mg (2.8 mmol) of thiourea, the mixture was stirred at room temperature for 5 hours. Then 10 ml of dimethylformamide, 157 mg (2.8 mmol) of potassium hydroxide and 2 ml of water were successively added thereto and the reaction mixture was heated at 100° C. for 3 hours. After cooling, the reaction mixture was poured into a saturated aqueous solution of sodium chloride and extracted with ethyl acetate. After concentrating, the residue was purified by silica gel. column chromatography. Thus 0.22 g of the title compound was obtained.

Provenance & Evidence