反应详情

To a mixture of 6-methoxy-3,4-dihydro-2H-isoquinolin-1-one (0.30 g, 1.69 mmol) in THF (10 mL) is added sodium hydride (60% mineral oil suspension, 100 mg). The suspension is heated at reflux for 1 h, and cooled to room temperature. Ethyl iodide (1.4 mL, 17 mmol) is added, and the mixture is stirred at room temperature overnight. The mixture is partitioned between EtOAc and water. After the aqueous phase is extracted with EtOAc (2×), the combined organic phase is washed with brine and dried (MgSO4). After removal of the solvent, the residue is purified by flash chromatography (Biotage 40M SiO2, elute 45% EtOAc:hexane−50% EtOAc:hexane, linear gradient) to yield 2-ethyl-6-methoxy-3,4-dihydro-2H-isoquinolin-1-one as a colorless oil (0.275 g, 78%). The material is dissolved in CH2Cl2 (10 mL) and cooled to −78° C. To the cooled mixture is added a solution of boron tribromide (1 M, 4.7 mL, 4.7 mmol) in CH2Cl2. After 0.5 h, the temperature is warmed to 0° C. and stirred for 3 h. After the reaction is carefully quenched with ice, EtOAc and water is added, and the mixture is vigorously stirred overnight. The phases are separated, and the organic phase is extracted with EtOAc (2×). The combined organic phase is washed with brine and dried (MgSO4). The solvent is removed in vacuo, and the residue is purified by chromatography (Varian 10 g SiO2 cartridge, elute 60% EtOAc:hexane) to provide 2-ethyl-6-hydroxy-3,4-dihydro-2H-isoquinolin-1-one (0.209 g, 82%). MS (ES+) 192.0

1. temperatureThe suspension is heated
2. temperatureat reflux for 1 h
3. customThe mixture is partitioned between EtOAc and water
4. extractionAfter the aqueous phase is extracted with EtOAc (2×)
5. washthe combined organic phase is washed with brine
6. dry with materialdried (MgSO4)
7. customAfter removal of the solvent
8. customthe residue is purified by flash chromatography (Biotage 40M SiO2, elute 45% EtOAc:hexane−50% EtOAc:hexane, linear gradient)