反应详情

温度

-70 °C

To a solution of 4-(4-bromo-pyridin-2-yl)-4-oxo-butyraldehyde (3) (720 mg, 2.97 mmol) in CH2Cl2 at −70° C. is added acetic acid (8.93 mg, 0.15 mmol), NaBH(OAc)3 (1.58 g, 7.44 mmol) and (R)-(+)-1-(4-methoxyphenyl)ethylamine (540 mg, 3.6 mmol). The reaction mixture is stirred at −70° C. for 1 hour, then warmed up to room temperature by removing the ice bath and letting it stir for another 2 hours. The reaction mixture is quenched by adding water (25 mL) is washed with 4×20 mL of water. The combined organic layers is concentrated and purified by flash column chromatography (hexane 70%, EtOAc 30%) to yield 4-bromo-2-{(1S,2S)-1-[1-(4-methoxy-phenyl)-ethyl]-pyrrolidin-2-yl}-pyridine (4) (386 mg, 36% yield) as a yellow solid: MS ES+363.10.

1. temperaturewarmed up to room temperature
2. customby removing the ice bath
3. stirringstir for another 2 hours
4. customThe reaction mixture is quenched
5. additionby adding water (25 mL)
6. washis washed with 4×20 mL of water
7. concentrationThe combined organic layers is concentrated
8. custompurified by flash column chromatography (hexane 70%, EtOAc 30%)