反应详情

To a solution of 59.8 g (377 mmol) 2-chloro-6-fluorobenzaldehyde in 250 ml toluene were added 41.0 ml (415 mmol) N-butylamine and 1.44 g (7.54 mmol) p-toluenesulphonic acid. The mixture was heated at reflux for 5 h. After cooling to room temperature, the mixture was diluted with toluene and washed sequentially with aqueous sodium bicarbonate solution, water and saturated brine. The organic layer was dried over Na2SO4, filtered and concentrated in vacuo to afford 80.1 g (99% of the title compound as a dark brown oil which was used in the next step without further purification. MS (ISP): 216.2 ([{37Cl}M+H]+), 214.2 ([{35Cl}M+H]+).

1. temperatureThe mixture was heated
2. temperatureat reflux for 5 h
3. washwashed sequentially with aqueous sodium bicarbonate solution, water and saturated brine
4. dry with materialThe organic layer was dried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo