反应详情

A mixture of 3-bromo-p-anisaldehyde (1 g, 4.65 mmol), pyrrolidine (1.9 ml, 23.2 mmol) and oxindole (0.62 g, 4.65 mmol) in dimethylformamide (7 ml) was held in a sealed tube at 100° C. for 12 hours. The mixture was cooled to room temperature and poured into 1N hydrochloric acid (100 ml). The precipitate which formed was filtered and washed with water. The precipitate was then dissolved in ethyl acetate (200 ml), the solution washed with brine, dried over magnesium sulfate and then concentrated. The solid obtained was chromatographed (silica, 30-40% ethyl acetate/hexanes) to give 0.63 g (42%) of 3-(3-bromo-4-methoxybenzylidene)-1,3-dihydroindol-2-one as a yellow solid.

1. customThe precipitate which formed
2. filtrationwas filtered
3. washwashed with water
4. dissolutionThe precipitate was then dissolved in ethyl acetate (200 ml)
5. washthe solution washed with brine
6. dry with materialdried over magnesium sulfate
7. concentrationconcentrated
8. customThe solid obtained
9. customwas chromatographed (silica, 30-40% ethyl acetate/hexanes)