反应详情

To a solution of 12.2 g of 2,6-dimethylphenol in methanol are added 20 ml of 30% sodium methoxide solution, and the resultant mixture is warmed to 50° C. The mixture is maintained at that temperature while 5.8 g of 4-chloromethylimidazole in methanol are added, with stirring. After the addition is complete, the reaction mixture is stirred at 50°-60° C. for about 4 hours, then is cooled and poured into cold water. That mixture is acidified with hydrochloric acid and washed with ethyl acetate. The pH of the aqueous solution is then adjusted to 7-8, and the product is obtained by extraction with ethyl acetate. The desired 4-(3',5'-dimethyl-4'-hydroxybenzyl)imidazole is obtained in 54% yield. The free base is converted to the corresponding hydrochloride salt by treatment with HCl in a mixture of ethyl acetate and isopropanol. That salt melts at 210°-214° C.

1. additionare added
2. additionAfter the addition
3. stirringthe reaction mixture is stirred at 50°-60° C. for about 4 hours
4. temperatureis cooled
5. washwashed with ethyl acetate
6. customthe product is obtained by extraction with ethyl acetate