反应详情

A suspension of 2,5-difluorobenzaldehyde (291.5 mg, 2.05 mmol), 2-methyl-2-nitropropane (427.3 mg, 4.14 mmol) and zinc (407.3 mg, 6.23 mmol) in ethanol (5 ml) was cooled to 0° C. in ice-water bath. Acetic acid (0.69 ml, 12.0 mmol) was added dropwise to the mixture. The mixture was gradually warmed to room temperature, stirred for 2 hours and let stand overnight. The mixture was filtered through Celite® bed and the filtrate was concentrated and purified by silica gel chromatography (hexane/ethyl acetate=10/1) to give the title compound (393 mg; 90%).

1. waitlet stand overnight
2. filtrationThe mixture was filtered through Celite® bed
3. concentrationthe filtrate was concentrated
4. custompurified by silica gel chromatography (hexane/ethyl acetate=10/1)