反应详情

温度

80 °C

To a solution of 4-ethyl-4-methylpiperidine (0.760 g, 5.98 mmol) and DIEA (2.1 mL, 11.9 mmol) in anhydrous CH3CN (15 mL) was added isopropyl 2-(5-bromo-4-chloro-2,6-dimethylpyridin-3-yl)-2-oxoacetate (2.0 g, 5.98 mmol) at rt. The resulting mixture was placed in a pre-heated oil bath (80° C.) and stirred for 24 h; cooled, diluted with ether, washed with water, brine, and dried (MgSO4). The crude product was charged (DCM) to a 80 g ISCO silica gel cartridge and gradient eluted (5-15% EtOAc/hexanes) using an Isolera chromatography station to give isopropyl 2-(5-bromo-4-(4-ethyl-4-methylpiperidin-1-yl)-2,6-dimethylpyridin-3-yl)-2-oxoacetate 2.51 g (99%). 1H NMR (500 MHz, CDCl3) δ 5.07-5.02 (m, 1H), 3.32 (br. s, 2H), 3.18 (br.s, 2H), 2.61 (s, 3H), 2.29 (s, 3H), 1.29-1.28 (m 12H), 0.89 (s, 3H), 0.80 (t, J=7.3 Hz, 3H). UPLC (M+H)=427.3.

1. customThe resulting mixture was placed in a pre-heated oil bath
2. temperaturecooled
3. washwashed with water, brine
4. dry with materialdried (MgSO4)
5. additionThe crude product was charged (DCM) to a 80 g ISCO silica gel cartridge and gradient
6. washeluted (5-15% EtOAc/hexanes)