反应详情

Pivaloyl chloride (85 mL, 0.69 mol) was added to a solution of 5-bromopyridin-2-amine (100 g, 0.58 mol) and Et3N (120 mL, 0.87 mmoL) in CH2Cl2 at −78° C. The temperature was allowed to warm to room temperature and the stirring was continued overnight. The reaction mixture was poured into water, extracted with CH2Cl2, dried over MgSO4, evaporated in vacuo and purified by silica gel column chromatography (10% EtOAc in petroleum ether) to afford N-(5-bromopyridin-2-yl)pivalamide (130 g, 87% yield). 1H NMR (CDCl3, 400 MHz) δ 8.28 (d, J=2.0 Hz, 1H), 8.17 (d, J=9.2 Hz, 1H), 7.99 (br s, 1H), 7.77 (dd, J=9.2 and 2.0, 1H), 1.28 (s, 9H).

1. extractionextracted with CH2Cl2
2. dry with materialdried over MgSO4
3. customevaporated in vacuo
4. custompurified by silica gel column chromatography (10% EtOAc in petroleum ether)