反应详情

5-Bromo-2,3-dihydro-3,3-dimethyl-2-hydroxybenzofuran (7.3 g), prepared as in Example 5(e) and cuprous cyanide (3.2 g) were heated under reflux in dimethylformamide (10 ml) with stirring for 51/2 hours. The mixture was cooled to room temperature and a solution of ferric chloride (6 g) in water (20 ml) containing hydrochloric acid (3.7 ml conc) was added. After heating at 60°-70° C. for 20 minutes the mixture was extracted with ether. The extracts were washed with water (twice), dried over magnesium sulphate and run down under vacuum to give 4.6 g of product, which on recrystallisation from toluene gave 2.0 g pure title product, mp 124°-127° C.

1. temperaturewere heated
2. additionwas added
3. temperatureAfter heating at 60°-70° C. for 20 minutes the mixture
4. extractionwas extracted with ether
5. washThe extracts were washed with water (twice),
6. dry with materialdried over magnesium sulphate