5-溴-2-氯苯乙腈

反应条件: temp:160.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: The above 5-bromo-2-chlorophenylacetonitrile was added to water (90 ml)-sulfuric acid (75 ml), and the mixture was stirred under heating at 160° C. overnight. The mixture was further diluted with water, and cooled to 0° C. The solvent was removed by decant, and the residue was dissolved in diethyl ether. The solution was washed with water and brine, and extracted with 10% sodium hydroxide. To the extract was added concentrated hydrochloric acid to make the solution acidic. The precipitates were collected by filtration, and purified by silica gel column chromatography (chloroform) to give 5-bromo-2-chlorophenylacetic acid (6.67 g) as colorless crystals. ESI-Mass m/Z 247/249 (M−H). cooled to 0° C The solvent was removed by decant the residue was dissolved in diethyl ether The solution was washed with water and brine extracted with 10% sodium hydroxide To the extract was added concentrated hydrochloric acid The precipitates were collected by filtration purified by silica gel column chromatography (chloroform)

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: The above 5-bromo-2-chlorobenzyl chloride was dissolved in acetonitrile (100 ml), and the mixture was cooled to 0° C. Added thereto was tetraethylammonium cyanide (8.8 g), and the mixture was stirred at room temperature for 2 hours. The solvent was evaporated under reduced pressure, and the residue was dissolved in ethyl acetate. The solution was washed successively with water, 10% aqueous hydrochloric acid solution, a saturated aqueous sodium hydrogen carbonate solution and brine, and dried over sodium sulfate. The solvent was evaporated under reduced pressure to give 5-bromo-2-chlorophenylacetonitrile as a pale yellow solid, which was used in the subsequent step without further purification. Added The solvent was evaporated under reduced pressure the residue was dissolved in ethyl acetate The solution was washed successively with water, 10% aqueous hydrochloric acid solution a saturated aqueous sodium hydrogen carbonate solution and brine, and dried over sodium sulfate The solvent was evaporated under reduced pressure