反应详情

温度

-78 °C

A solution of 0.36 g of 3,5-dichloro-1-(3,3-dichloro-2-propenyloxy)-4-(4-(3-chloro-4,4-difluoro-2-hydroxy-3-butenyloxy)butyloxy)benzene in 5 ml of dichloromethane was slowly added dropwise to a solution of 0.12 g of diethylaminosulfur trifluoride (DAST) in 10 ml of dichloromethane with stirring at -78° C. After complement of the dropwise addition, the reaction mixture was returned to room temperature over 30 minutes and poured into water. The dichloromethane layer was separated, washed with water, dried over magnesium sulfate and then evaporated to give a crude product. The crude product was subjected to silica gel chromatography, which afforded 0.20 g of (Z)-3,5-dichloro-1-(3,3-dichloro-2-propenyloxy)-4-(4-(3-chloro-4,4,4-trifluoro-2-butenyloxy)butyloxy)benzene (yield, 55%), nD23.7 1.5160.

1. additionAfter complement of the dropwise addition
2. customThe dichloromethane layer was separated
3. washwashed with water
4. dry with materialdried over magnesium sulfate
5. customevaporated
6. customto give a crude product