反应详情

温度

-10 °C

7.3 g of 8-bromo-2,3,4,5-tetrahydro-1-benzoxepine in 30 ml of absolute tetrahydrofuran were added under argon to 930 mg shavings and a granule of iodine. The reaction was intitiated by the addition of a few drops of 1,2-dibromoethane and has finished after 2 hours. Thereafter, the reaction mixture was cooled to -10° C. and excess acetaldehyde was distilled into the reaction vessel. After 10 minutes, the mixture was hydrolyzed with saturated sodium bicarbonate (NaHCO3) solution, extracted with ether, washed with water, dried and evaporated to dryness. Chromatography on silica gel (petroleum ether/ethyl acetate 3:1) yielded 4.93 g of 2,3,4,5-tetrahydro-α-methyl-1-benzoxepine-8-methanol as a colorless oil.

1. distillationexcess acetaldehyde was distilled into the reaction vessel
2. waitAfter 10 minutes
3. extractionextracted with ether
4. washwashed with water
5. customdried
6. customevaporated to dryness