Br[C:2]1[C:7]([O:8][CH2:9][O:10][CH3:11])=[CH:6][CH:5]=[CH:4][N:3]=1.C([Li])CCC.[Li].[N+:18]([C:21]1[CH:28]=[CH:27][C:24]([CH:25]=[O:26])=[CH:23][CH:22]=1)([O-:20])=[O:19]>C(OCC)C.CCCCCC.O1CCCC1.O>[CH3:11][O:10][CH2:9][O:8][C:7]1[C:2]([CH:25]([C:24]2[CH:23]=[CH:22][C:21]([N+:18]([O-:20])=[O:19])=[CH:28][CH:27]=2)[OH:26])=[N:3][CH:4]=[CH:5][CH:6]=1Under nitrogen atmosphere, to a solution of 2-bromo-3-methoxymethoxypyridine (10.00 g) in diethylether (150 ml) was added a solution of n-butyllithium in hexane (1.6M, 31.5 ml) at −78° C., and the mixture was stirred for 1 hour to prepare the lithium salt. The resulting lithium salt was dropwise added to a solution of 4-nitrobenzaldehyde (6.93 g) in tetrahydrofuran (100 ml ) cooled at −78° C., and the mixture was stirred at the same temperature for 3 hours. To the reaction mixture was added water to stop the reaction, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated sodium chloride solution, dried with magnesium sulfate and concentrated under reduced pressure. The residue was separated and purified with column chromatography (ethyl acetate/hexane=1:3→1:2) to give (3-methoxymethoxypyridin-2-yl)-(4-nitrophenyl)-methanol (11.78 g) as yellow oil.
読み込み中…
