反应详情

A solution of 4-amino-1-naphthalenecarbonitrile (19.2 g, 114 mmol) and maleic anhydride (14.0 g, 113 mmol) in AcOH (230 mL) was heated at 115° C. for 12 h. After cooling to rt, the reaction mixture was concentrated under reduced pressure then diluted with CH2Cl2 (2.5 L). The organic layer was washed 3× with H2O (3 L), 1× with sat. aq. Na2CO8 (1 L) and 1× with brine (1 L), dried over MgSO4 and concentrated to −200 mL under reduced pressure. Purification by flash chromatography on cation exchange resin (60 g, CUBX13M6 from United Chemical Technologies) eluting with CH2Cl2 gave 25.0 g (88%) of 4-(2,5-dihydro-2,5-dioxo-1H-1-yl)]-naphthalenecarbonitrile as a yellow solid. HPLC: 96% at 2.48 min (retention time) (Phenomenex-prime S5-C18 column 4.6×50 mm, 10–90% aqueous methanol over 4 minutes containing 0.2% phosphoric acid, 4 mL/min, monitoring at 220 nm). MS (ES): m/z 249.25 [M+H]+.

1. concentrationthe reaction mixture was concentrated under reduced pressure
2. additionthen diluted with CH2Cl2 (2.5 L)
3. washThe organic layer was washed 3× with H2O (3 L), 1× with sat. aq. Na2CO8 (1 L) and 1× with brine (1 L)
4. dry with materialdried over MgSO4
5. concentrationconcentrated to −200 mL under reduced pressure
6. customPurification by flash chromatography on cation exchange resin (60 g, CUBX13M6 from United Chemical Technologies)
7. washeluting with CH2Cl2