反应详情

温度

-78 °C

To a solution of N-(carbobenzyloxy)-4-bromoaniline (5.00 g) in dry tetrahydrofuran (80 mL) at −78° C. under N2 is added n-butyllithium (21.4 mL, 1.6 M in hexanes) dropwise over five minutes. The resulting yellow solution is stirred at −78° C. for 30 minutes and is then treated with a solution of N-(carbobenzyloxy)-4-piperidone (3.99 g) in dry tetrahydrofuran (17 mL). The reaction mixture is stirred for three hours, during which the reaction temperature is allowed to rise to 0° C., and is quenched with saturated aqueous ammonium chloride (30 mL). The mixture is then diluted with water (100 mL), the layers are separated, the aqueous phase is extracted with diethyl ether, and the combined organic phase is washed with saline (50 mL), dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue is chromato-graphed on silica gel (230-400 mesh, 350 g), eluting with ethyl acetate/hexane (25/75), and those fractions with an Rf=0.38 by TLC (ethyl acetate/hexane, 50/50) are pooled and con-centrated under reduced pressure by give the title compound, mp 156° C.-158° C.

1. stirringThe reaction mixture is stirred for three hours, during which the reaction temperature
2. customto rise to 0° C.
3. customis quenched with saturated aqueous ammonium chloride (30 mL)
4. additionThe mixture is then diluted with water (100 mL)
5. customthe layers are separated
6. extractionthe aqueous phase is extracted with diethyl ether
7. washthe combined organic phase is washed with saline (50 mL)
8. dry with materialdried over anhydrous sodium sulfate
9. concentrationconcentrated under reduced pressure
10. washeluting with ethyl acetate/hexane (25/75)