反应详情

Lithium hydroxide monohydrate (600 mg, 25.0 mmol) was added to a solution of the amine 3 (1.44 g, 8.53 mmol) dissolved in CH2Cl2 (125 mL) at 0° C. A solution of acetyl bromide (1.97 mL, 25.6 mmol) in CH2Cl2 (10 mL), was added dropwise over 5 minutes at 0° C. to the reaction mixture which was then allowed to warm to ambient temperature and stirred for 2 hours. The reaction crude was filtered, concentrated under reduced pressure, and purified by flash chromatography over silica, eluting with a gradient of 100% CH2Cl2 to 10% MeOH/90% CH2Cl2, yielding product 4 as white solid (1.11 g, 61.5%).

1. customThe reaction crude
2. filtrationwas filtered
3. concentrationconcentrated under reduced pressure
4. custompurified by flash chromatography over silica
5. washeluting with a gradient of 100% CH2Cl2 to 10% MeOH/90% CH2Cl2