反应详情

温度

25 °C

In an atmosphere of nitrogen, 3.29 g (20 mmol) of 2-tert-butyl-4-methylphenol was dissolved in 10 ml of diethyl ether and 6.7 ml of methylmagnesium bromide (20 mmol of diethyl ether solution) was added dropwise to this at 0° C. for 5 minutes. After completion of the dropwise addition, the reaction mixture was stirred at 25° C. for 10 minutes, subsequently, the diethyl ether was evaporated under vacuum, and 30 ml of toluene was added to-obtain a toluene solution of 2-tert-butyl-4-methylphenoxymagnesium bromide. To the solution, 1.07 g (10 mmol) of picolinaldehyde was added dropwise at 25° C. and it was reacted for 5 hours while refluxing. After cooling, the reaction was stopped by adding aqueous 5% hydrochloric acid solution and successively, after neutralizing it with aqueous sodium hydrogencarbonate solution, the organic layer obtained was washed with a saturated aqueous sodium chloride solution. After drying it over anhydrous magnesium sulfate, the solvent was distilled off. The residue was purified by silica gel column chromatography (a developing solvent: hexane/ethyl acetate=20/1-1/1) to obtain 2-bis(2-hydroxy-3-tert-butyl-5-methylphenyl)methylpyridine.

1. additionAfter completion of the dropwise addition
2. customsubsequently, the diethyl ether was evaporated under vacuum, and 30 ml of toluene
3. additionwas added