反应详情

2-[4-(2-Furanyl)butyl]-1H-isoindole-1,3(2H)-dione (5.38 g), paraformaldehyde (1.2 g) and dimethylamine hydrochloride (3.26 g) were refluxed in absolute ethanol (100 ml). After 6 hr further paraformaldehyde (0.6 g) and dimethylamine hydrochloride (1.6 g) were added and heating continued for a further 20 hr. The solvent was removed, the residue made strongly basic with 5N sodium hydroxide, extracted with ethyl acetate and the organic layer evaporated. The crude product was purified by column chromatography to give an amber oil (3.25 g) Rf 0.4 silica/methanol. NMR (CDCl3) 8-8.6 m (4H); 7.75 s (6H); 7.3 m (2H); 6.55 s (2H); 6.3 m (2H); 4.0 m (2H); 1.9-2.4 m (4H).

1. temperatureheating
2. customThe solvent was removed
3. extractionextracted with ethyl acetate
4. customthe organic layer evaporated
5. customThe crude product was purified by column chromatography