反应详情

温度

35 °C

2-bromo-5-methoxyaniline (6 g; 29.7 mmol) was dissolved in acetic acid (33.7 ml) and 2,6-dioxo-3,6-dihydro-2H-pyran-4-yl acetate (4.59 g; 27.0 mmol) was added. The reaction was stirred at 35° C. in a sand bath for 2 h. The reaction was quenched by adding ice-water (250 ml), the precipitate formed was filtered, washed with water and dried over phosphorus pentoxide under reduced pressure to afford 8.98 g (71%) of 1-(2-bromo-5-methoxyphenylamino)-1,5-dioxohex-3-en-3-yl acetate as a grey solid.

1. customThe reaction was quenched
2. additionby adding ice-water (250 ml)
3. customthe precipitate formed
4. filtrationwas filtered
5. washwashed with water
6. dry with materialdried over phosphorus pentoxide under reduced pressure