反应详情

A mixture containing 3-bromobenzaldehyde (135; 18.5 g, 100 mmol), propane-1,3-diol (9.1 g, 120 mmol) and TsOH (0.1 g) in toluene (200 mL) was stirred under reflux in a Dean-Stark water separator for 18 h. Upon cooling to room temperature, the mixture was washed with 5% aqueous Na2CO3 (200 mL), dried (Na2SO4) and concentrated under reduced pressure to afford essentially quantitative yield of crude 2-(3-bromophenyl)-1,3-dioxane 136 as a yellow oil (25 g).

1. washthe mixture was washed with 5% aqueous Na2CO3 (200 mL)
2. dry with materialdried (Na2SO4)
3. concentrationconcentrated under reduced pressure