反应详情

A mixture of 5-methoxyisobenzofuran-1,3-dione (33.0 g), 4-pyridinylhydrazine hydrochloride (25.7 g) and glacial acetic acid (100 ml) was heated overnight, under reflux, under nitrogen, with stirring. Water (100 ml) was added, and the mixture was evaporated and dried in vacuo. The residue was triturated with acetone, the acetone decanted, and the residue was triturated with methanol to give 16.1 g of 5-methoxy-2-(4-pyridinylamino)isoindol-1,3-dione. To a mixture of lithium aluminum hydride (6.00 g) and dry tetrahydrofuran (150 ml) at ambient temperature, under nitrogen, 5-methoxy-2-(4-pyridinylamino)isoindol-1,3-dione hydrochloride (16.1 g) was added in portions, with stirring. The reaction mixture was stirred at room temperature, under nitrogen, 4 hrs, and sodium sulfate decahydrate was added in portions. The mixture was filtered through a bed of celite, the filter cake was washed thoroughly with ethyl acetate, and the filtrate was concentrated in vacuo. The residue was chromatographed over silica gel, eluting with 7% methanol-dichloromethane followed by 185:14:1 dichloromethane:methanol:ammomium hydroxide. The appropriate fractions were collected and concentrated. The residue was crystallized from ethanol to give 5.8 (46%) of product, mp 166-167° C.

1. temperaturewas heated overnight
2. temperatureunder reflux, under nitrogen
3. customthe mixture was evaporated
4. customdried in vacuo
5. customThe residue was triturated with acetone
6. customthe acetone decanted
7. customthe residue was triturated with methanol