反応 #308326

反応方程式

5-Bromo-2-chlorophenyl 6-bromo-3-pyridyl ketone

cerium(III) chloride

sodium hydrogen carbonate

triethylaluminium

→

5-bromo-2-chlorophenyl 6-ethyl-3-pyridyl ketone

溶媒

tetrahydrofuran

methanol

反応条件

後処理

1. 1
   workup.ADDITIONadded
2. 2
   ろ過The insoluble materials were filtered off
3. 3
   抽出the filtrate was extracted with ethyl acetate
4. 4
   乾燥dried over magnesium sulfate
5. 5
   その他The solvent was evaporated under reduced pressure
6. 6
   その他the residue was purified by silica gel column chromatography (hexane:ethyl acetate=99:1-85:15)

実験手順

5-Bromo-2-chlorophenyl 6-bromo-3-pyridyl ketone (3.2 g) from Reference Example 135-(2) was dissolved in tetrahydrofuran (80 ml), and added thereto were triethylaluminium (1.0 M hexane solution, 9.9 ml), tetrakis(triphenylphosphine)palladium(0) (570 mg) and cerium(III) chloride (7.3 g), and the mixture was stirred at 30° C. for 1.5 hours. The reaction mixture was diluted with methanol, and the reaction solution was basified with a saturated aqueous sodium hydrogen carbonate solution. The insoluble materials were filtered off and, the filtrate was extracted with ethyl acetate and dried over magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (hexane:ethyl acetate=99:1-85:15) to give 5-bromo-2-chlorophenyl 6-ethyl-3-pyridyl ketone (1.98 g) as a colorless solid. APCI-Mass m/Z 324/326 (M+H). (2) The above 5-bromo-2-chlorophenyl 6-ethyl-3-pyridyl ketone was treated in a manner similar to Reference Example 14-(1) to give the desired 5-bromo-2-chloro-1-(6-ethyl-3-pyridylmethyl)benzene as a colorless oil. APCI-Mass m/Z 310/312 (M+H).

出典