2-Bromoanisole → 2-Chloro-5-(2-methoxybenzoyl)pyridine

반응식

Br[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[O:8][CH3:9].[Li]CCCC.[Cl:15][C:16]1[CH:27]=[CH:26][C:19]([C:20](N(OC)C)=[O:21])=[CH:18][N:17]=1>C1COCC1>[Cl:15][C:16]1[N:17]=[CH:18][C:19]([C:20]([C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=2[O:8][CH3:9])=[O:21])=[CH:26][CH:27]=1

참가 물질

실험 절차

To a solution of 1-bromo-2-methoxy-benzene (49.2 g, 0.263 mol) in dry THF (500 mL) was added dropwise n-BuLi (2.5 M in hexane, 105 mL, 0.263 mol) at −78° C. under N2 atmosphere. The mixture was stirred at this temperature for 1 hr and then a solution of 6-chloro-N-methoxy-N-methyl-nicotinamide (50 g, 0.25 mol) in THF (100 mL) was added dropwise. The reaction mixture was warmed to room temperature, stirred overnight and then was quenched with a saturated solution of NH4Cl (300 mL). The separated aqueous layer was extracted with ethyl acetate (3×300 mL). The combined organic layers were washed with brine, dried over Na2SO4, evaporated in vacuo to give the crude product that was purified by column chromatography to yield (6-chloropyridin-3-yl)-(2-methoxyphenyl)-methanone as a white solid (31 g, 47.6%).