反应详情

Ethyl magnesium bromide (3.0 mL, 3.0 mmol) was added dropwise over 10 min to a solution of the pyridine nitrile A466.2 (500 mg, 2.75 mmol) in THF (5 mL) at room temperature under a nitrogen atmosphere. After stirring for 30 min at room temperature, the reaction mixture was then cooled to 0° C. and anhydrous methanol added (2.75 mL) followed by sodium borohydride (115 mg, 3.0 mmol). The mixture was allowed to warm to room temperature over 1 hr before quenching with saturated ammonium chloride solution (10 mL) and stirring overnight at room temperature. The mixture was diluted with water (20 mL) and extracted with ethyl acetate (3×30 mL). The combined organics were dried (MgSO4), evaporated in vacuo and purified by column chromatography using 10% MeOH in ethyl acetate as eluant to yield A466.3 (237 mg). HPLC YMC S-5 4.6×33 mm (2 min grad): retention time 0.87 min, M+H+=217.15

1. temperaturethe reaction mixture was then cooled to 0° C.
2. temperatureto warm to room temperature over 1 hr
3. custombefore quenching with saturated ammonium chloride solution (10 mL)
4. stirringstirring overnight at room temperature
5. additionThe mixture was diluted with water (20 mL)
6. extractionextracted with ethyl acetate (3×30 mL)
7. dry with materialThe combined organics were dried (MgSO4)
8. customevaporated in vacuo
9. custompurified by column chromatography
10. customto yield A466.3 (237 mg)
11. custom4.6×33 mm (2 min grad)