反应详情

A solution of 3,5-difluorophenol (35.5 g, 273 mmol) and methyl propiolate (25.0 mL, 300 mmol) in acetonitrile (109 mL) was added to a solution of tetrabutylammonium fluoride in tetrahydrofuran (1.0 M commercial solution, 109 mL, 109 mmol) at room temperature over a period of 2 hours. After complete addition of the solution, the mixture was stirred for 1 hour. The reaction mixture was diluted with toluene (350 mL) and the organic mixture was washed twice with water (250 mL×2), dried over magnesium sulfate, and concentrated in vacuum. The residue was purified by column chromatography on amino gel (hexane:ethyl acetate=3:2 as an eluent) to afford the title compound as a yellow solid (60.0 g, quant, 1:1 mixture of cis- and trans-isomers).

1. additionAfter complete addition of the solution
2. washthe organic mixture was washed twice with water (250 mL×2)
3. dry with materialdried over magnesium sulfate
4. concentrationconcentrated in vacuum
5. customThe residue was purified by column chromatography on amino gel (hexane