反应详情

9.8 g of 1-(5-bromo-2-methoxyphenyl)-1-methylethanol and 15.24 g of 2-(trimethylsilyloxy)-acrylic acid ethyl ester in 150 ml of dichloromethane are mixed at −70° C. with 5.6 ml of tin tetrachloride. After 20 minutes at −70° C., the solution is poured onto a semi-saturated potassium carbonate solution and mixed with dichloromethane. The dichloromethane phase is washed with potassium carbonate solution, 1 M hydrochloric acid and water, dried (Na2SO4) and concentrated by evaporation. After bulb tube distillation, 5.2 g of 4-(5-bromo-2-methoxyphenyl)-4-methyl-2-oxopentanoic acid-ethyl ester is obtained. Boiling point: 160° C./0.04 hPa

1. washThe dichloromethane phase is washed with potassium carbonate solution, 1 M hydrochloric acid and water
2. dry with materialdried (Na2SO4)
3. concentrationconcentrated by evaporation
4. distillationAfter bulb tube distillation