反应详情

38.1 ml of chlorotrimethylsilane are added over 45 minutes to a solution of 40.45 g of 1-[4-(hydroxy-3,3,5,5-tetramethylcyclohexyl)phenyl]ethanone (compound V′.1) and 56.21 g of sodium iodide in 230 ml of anhydrous acetonitrile. During the addition, the temperature is maintained between 35° C. and 40° C. After stirring for 2 hours, 40 ml of acetonitrile and 39.4 ml of acetic acid are added. Next, 29.4 g of finely powdered zinc are added portionwise with stirring and at room temperature. The reaction mixture is refluxed with vigorous stirring for 4 hours. After cooling to room temperature, the reaction medium is filtered through Celite and then washed with saturated aqueous sodium bicarbonate solution. The organic phase is concentrated under reduced pressure and the oil obtained is purified by chromatography on a column of silica gel, eluting with a 95/5 (v/v) cyclohexane/ethyl acetate mixture; yield=68% ; m.p.=54° C. The following compounds are obtained in the same way:

1. additionDuring the addition
2. temperaturethe temperature is maintained between 35° C. and 40° C
3. stirringwith stirring and at room temperature
4. temperatureThe reaction mixture is refluxed
5. stirringwith vigorous stirring for 4 hours
6. filtrationthe reaction medium is filtered through Celite
7. washwashed with saturated aqueous sodium bicarbonate solution
8. concentrationThe organic phase is concentrated under reduced pressure
9. customthe oil obtained
10. customis purified by chromatography on a column of silica gel
11. washeluting with a 95/5 (v/v) cyclohexane/ethyl acetate mixture
12. customThe following compounds are obtained in the same way