反应详情

Dissolve 2-(6-bromo-pyridin-2-yl)-propan-2-ol (10.6 g, 50 mmol) in acetonitrile (40 mL). Add BF3-Et2O (20 mL, 125 mmol) and reflux for 3 days. Cool to room temperature, add ice and neutralize the reaction with 5N NaOH and extract with dichloromethane. Purify over silica (120 g) eluting with 0 to 100% EtOAc:hexanes to give N-[1-(6-bromo-pyridin-2-yl)-1-methyl-ethyl]-acetamide (3.3 g, 26%), MS (m/z): 257 and 259 (M+H)+ and recovered 2-(6-bromo-pyridin-2-yl)-propan-2-ol (3.7 g, 34%).

1. additionadd ice
2. extractionextract with dichloromethane
3. customPurify over silica (120 g)
4. washeluting with 0 to 100% EtOAc