反应详情

To a solution of diethyl benzylphosphonate (2.5 g) in tetrahydrofuran (500 ml) was added Red-Al (70% toluene solution) (3.8 g) at room temperature, and the mixture was stirred until gas production stopped. To the reaction mixture was added 1,5-dibromopentane (25.18 g), and the mixture was stirred at 50-60° C. for 16 hours. To the reaction mixture was added water (20 ml), and precipitate was removed by filtration. The filtrate was concentrated under reduced pressure, and the residue was separated and purified with column chromatography (ethyl acetate→ethanolethyl acetate=1:2) to give 1-benzylphosphorinane-1-oxide (8.41 g) as colorless crystals.

1. stirringthe mixture was stirred at 50-60° C. for 16 hours
2. customwas removed by filtration
3. concentrationThe filtrate was concentrated under reduced pressure
4. customthe residue was separated
5. custompurified with column chromatography (ethyl acetate→ethanolethyl acetate=1:2)