反应详情

温度

45 °C

54 g of 2',4'-dichloro-2-(3-pyridyl)-acetophenone are added portionwise under an inert gas to a suspension of 46.5 g of freshly sublimed potassium tert.butylate in 590 ml of tert.butanol and the reaction mixture is stirred at 45° C. for 2 hours. The mixture is treated at room temperature with 59.5 g of 2-chloroethyl-dimethylsulphonium iodide and a spatula tip of sodium iodide and the mixture is held at 50° C. for 16 hours while stirring vigorously. The mixture is poured into water and extracted three times with 300 ml of diethyl ether each time. The combined organic extracts are washed with water, dried over anhydrous sodium sulphate and evaporated under reduced pressure. The residue is chromatographed on silica gel with diethyl ether as the eluent and crystallized from diethyl ether/n-hexane. There are obtained 41.7 g of 2,4-dichlorophenyl 1-(3-pyridyl)-cyclopropyl ketone as white crystals, m.p. 83° C.

1. stirringwhile stirring vigorously
2. extractionextracted three times with 300 ml of diethyl ether each time
3. washThe combined organic extracts are washed with water
4. dry with materialdried over anhydrous sodium sulphate
5. customevaporated under reduced pressure
6. customThe residue is chromatographed on silica gel with diethyl ether as the eluent
7. customcrystallized from diethyl ether/n-hexane