Reacción #75425

Ecuación de reacción

methyl chloroformate

(R)-1,2,3,4-tetrahydro-1-methoxy-2-oxo-3-quinolinamine

sodium bicarbonate

→

title compound

Rendimiento 99.0%

Methyl (R)-N-(1,2,3,4-tetrahydro-1-methoxy-2-oxo-3-quinolinyl)carbamate

Rendimiento 99.0%

Disolventes

chloroform

chloroform

water

pentane

Condiciones de reacción

Tratamiento posterior

1. 1
   Otrothe layers were separated
2. 2
   ExtracciónThe aqueous layer was extracted with diethylether
3. 3
   Lavadothe combined organic extracts were washed with brine
4. 4
   Secadodried (MgSO4)
5. 5
   OtroThe solvent was removed under vacuum
6. 6
   Otroto leave an amber oil
7. 7
   OtroPurification by flash chromatography (230-400 mesh silica gel, 35-40% ethyl acetate in hexane)

Procedimiento

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%).

Fuente