Methyl anisate → 2-(4-Bromopyridin-2-yl)-1-(4-methoxyphenyl)ethanone
反応式
[CH3:1][O:2][C:3]1[CH:12]=[CH:11][C:6]([C:7]([O:9]C)=O)=[CH:5][CH:4]=1.[Br:13][C:14]1[CH:19]=[CH:18][N:17]=[C:16]([CH3:20])[CH:15]=1.C[Si](C)(C)[N-][Si](C)(C)C.[Li+]>O1CCCC1>[Br:13][C:14]1[CH:19]=[CH:18][N:17]=[C:16]([CH2:20][C:7]([C:6]2[CH:5]=[CH:4][C:3]([O:2][CH3:1])=[CH:12][CH:11]=2)=[O:9])[CH:15]=1参加物
5
実験手順
In a 250 mL round-bottomed flask at 0° C. under nitrogen was added methyl 4-methoxybenzoate (Aldrich, 3.32 g, 20.00 mmol) and 4-bromo-2-methylpyridine (Frontier, 1.72 g, 10.00 mmol) in anhydrous tetrahydrofuran (40.0 mL) to give a yellow solution. Lithium hexamethyldisilazide (1 M in tetrahydrofuran, 20 mL, 20 mmol) was added dropwise over 15 minutes via a dropping addition funnel to produce an orange transparent solution that was stirred for 18 hours at ambient temperature. The mixture was partitioned between ethyl acetate and water. The organic layer was washed with brine, dried (Na2SO4), filtered and concentrated to a reddish oil. Purification by flash chromatography on a silica 80 g cartridge eluting with 10-60% ethyl acetate in hexane gave the title compound (2.68 g, 88%). MS (APCI+) m/z 306/308 (M+H)+.