反应详情

A solution of 4-cyclopropylmethoxy-3,5-dichlorophenol (1.54 g; 6.6 mmoles) in DMF (5 ml) is added dropwise, at 0° C., to a suspension of sodium hydride (0.16 g; 6.6 mmoles) in N,N-dimethyl formamide (DMF; 5 ml). The mixture is kept under stirring at room temperature for 30 minutes and a solution of methyl (E)-2-(2bromomethylphenyl)-3-methoxyacrylate (1.9 g; 6.6 mmoles) in DMF (5 ml) is then added. The mixture is kept under stirring for 4 hours; the mixture is diluted with water (40 ml) and an extraction is effected with ethyl acetate (3×25 ml). The organic phases are joined, washed with water (2×20 ml), dried with sodium sulfate, filtered and concentrated at reduced pressure. The raw product obtained is purified by means of silica gel chromatography, eluting with hexane/ethyl acetate 9:1. 1.9 g of the desired product (thick oil) are obtained.

1. stirringunder stirring for 4 hours
2. extractionan extraction
3. washwashed with water (2×20 ml)
4. dry with materialdried with sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated at reduced pressure
7. customThe raw product obtained
8. customis purified by means of silica gel chromatography
9. washeluting with hexane/ethyl acetate 9:1