反应详情

A solution of methyl chloroformate (42.8 g, 0.453 mol) in chloroform (50 ml) was added to a mixture of (R)-1,2,3,4-tetrahydro-1-methoxy-2-oxo-3-quinolinamine 1 (M. Kawase, T. Kitamura, Y. Kikugawa, J. Org. Chem., 54, 1989 3394-3403)(0.15 mol) and sodium bicarbonate (50.4 g, 0.600 mol) in chloroform (250 ml) and water (100 ml) over a period of 10 minutes at 0° C. The mixture was stirred overnight at room temperature, diluted with pentane, and the layers were separated. The aqueous layer was extracted with diethylether, and the combined organic extracts were washed with brine and dried (MgSO4). The solvent was removed under vacuum to leave an amber oil. Purification by flash chromatography (230-400 mesh silica gel, 35-40% ethyl acetate in hexane) gave the title compound as a light yellow oil (37.0 g, 99%).

1. customthe layers were separated
2. extractionThe aqueous layer was extracted with diethylether
3. washthe combined organic extracts were washed with brine
4. dry with materialdried (MgSO4)
5. customThe solvent was removed under vacuum
6. customto leave an amber oil
7. customPurification by flash chromatography (230-400 mesh silica gel, 35-40% ethyl acetate in hexane)