反应详情

A solution of sodium cyanide (75.12 g, 1.53 mol) in water (300 mL) was added dropwise to a solution of ethyl 2-(bromomethyl)-3,6-dichlorobenzoate (253c, 320 g, 1.03 mol) in dimethylsulfoxide (2.4 L) at room temperature. The mixture was stirred at room temperature for 1.5 hours. The reaction mixture was poured into a mixture of water (4 L) and methyl tert-butyl ether (2 L), and the layers separated. The organic layer was washed with water (2 L) and with saturated aqueous sodium chloride solution (2 L), dried over sodium sulfate, and concentrated in vacuo. The residue was purified by silica gel chromatography (eluting with 30:1 petroleum ether/ethyl acetate), affording ethyl 3,6-dichloro-2-(cyanomethyl)benzoate (253d, 150 g, ˜75% pure, 47% yield) as a yellow oil.

1. customthe layers separated
2. washThe organic layer was washed with water (2 L) and with saturated aqueous sodium chloride solution (2 L)
3. dry with materialdried over sodium sulfate
4. concentrationconcentrated in vacuo
5. customThe residue was purified by silica gel chromatography (eluting with 30:1 petroleum ether/ethyl acetate)