反应详情

A solution of 10 g (57.7 mmol) of 6-methoxy-2-methylquinoline and 30 drops of pyridine in 40 mL of N,N-dimethylformamide was stirred at 60° C. while a solution of 16.21 g (57.7 mmol) of tribromoacetaldehyde in 20 mL of N,N-dimethylformamide was added over 15 min. The reaction mixture was stirred for another 2 hr and then cooled and poured onto 600 mL of ice-water. Work-up with ethyl acetate was carried out in the usual manner. The crude product was purified by flash chromatography on 800 g of silica gel, eluting with hexane-ethyl acetate (4:1) afforded 4.45 g (30.6%) of the title compound as a violet solid. An analytical sample was obtained by recrystallization from ethanol to give colorless crystals, mp 103° C.

1. additionwas added over 15 min
2. temperaturecooled
3. customThe crude product was purified by flash chromatography on 800 g of silica gel
4. washeluting with hexane-ethyl acetate (4:1)