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 5 N 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