2-Bromopyridine → alpha-(3,4-Dimethoxy-5-nitrophenyl)-2-pyridinemethanol

반응식

Br[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][N:3]=1.C([Li])CCC.[CH3:13][O:14][C:15]1[CH:16]=[C:17]([CH:20]=[C:21]([N+:25]([O-:27])=[O:26])[C:22]=1[O:23][CH3:24])[CH:18]=[O:19]>O1CCCC1>[CH3:13][O:14][C:15]1[CH:16]=[C:17]([CH:18]([C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][N:3]=2)[OH:19])[CH:20]=[C:21]([N+:25]([O-:27])=[O:26])[C:22]=1[O:23][CH3:24]

참가 물질

실험 절차

2.76 ml of 2-bromopyridine dissolved in 30 ml of absolute tetrahydrofuran are treated -60° within 30 minutes with 19.2 ml of 1.6M n-butyl lithium solution (in hexane), whereupon the mixture is stirred at -60° for 30 minutes. 6.0 g of 3,4-dimethoxy-5-nitrobenzaldehyde dissolved in 50 ml of tetrahydrofuran are then added dropwise thereto at -40° within 30 minutes. The reaction mixture is warmed to 0° within 2 hours, poured into ice-water and extracted with ethyl acetate. The combined extracts are dried over sodium sulfate and evaporated, and the residue is chromatographed on 200 g of silica gel with ethyl acetate. There is obtained α-(3,4-dimethoxy-5-nitrophenyl)-2-pyridinemethanol as a brown oil.