反应详情

A solution of benzaldehyde 5.1 ml (50.0 mmol) in 2,2-diethoxyethanamine 10.9 ml (75.0 mmol) was stirred at room temperature for 0.5 hour. The reaction mixture was diluted with tetrahydrofuran 450 ml and triacetoxyborohydride 32.0 g (150 mmol) was added and the mixture was stirred overnight. The reaction mixture was diluted with ethyl acetate 500 ml and washed with saturated sodium bicarbonate 500 ml, water 500 ml and brine 500 ml. The organic phase was dried over magnesium sulfate and filtered. The filtrate was concentrated in vacuo and the residue was purified on silica gel column chromatography (n-hexane:ethyl acetate=70:30 to 50:50) to obtain the title compound 7.8 g (yield 70%).

1. additionwas added
2. washwashed with saturated sodium bicarbonate 500 ml, water 500 ml and brine 500 ml
3. dry with materialThe organic phase was dried over magnesium sulfate
4. filtrationfiltered
5. concentrationThe filtrate was concentrated in vacuo
6. customthe residue was purified on silica gel column chromatography (n-hexane:ethyl acetate=70:30 to 50:50)