反应详情

0.26 g (6.87 mmol) of sodium hydride is added portionwise to a solution at 0° C. of 1.75 g (6.87 mmol) of ethyl (diethoxyphosphoryl)ethoxyacetate (prepared according to Example 1b) in 20 mL of tetrahydrofuran. The reaction mixture is stirred for 45 minutes at room temperature and 2 g (6.25 mmol) of 3-(2-ethoxyethoxy)-4-iodobenzaldehyde in 10 mL of tetrahydrofuran are then added dropwise. The reaction is slightly exothermic, and the reaction mixture is maintained at a temperature of 25-30° C. with an ice-water bath. When the temperature has stabilized, the reaction mixture is stirred for 24 hours at room temperature. After addition of 50 mL of water, the reaction medium is extracted with ethyl acetate. The organic phases are combined, washed with saturated sodium chloride solution and then dried over sodium sulfate. After evaporating under vacuum, the crude product obtained is purified by chromatography on a column of silica eluted with a 90/10 heptane/ethyl acetate mixture to give 61.2 mg of the (E) isomer of ethyl 3-[3-(2-ethoxyethoxy)-4-iodophenyl]-2-ethoxyacrylate, 1.56 g of a mixture of (Z) and (E) isomers and 270.3 mg of the isomer ethyl (Z)-3-[3-(2-ethoxyethoxy)-4-iodophenyl]-2-ethoxyacrylate in the form of yellow oils.

1. temperaturethe reaction mixture is maintained at a temperature of 25-30° C. with an ice-water bath
2. stirringthe reaction mixture is stirred for 24 hours at room temperature
3. extractionthe reaction medium is extracted with ethyl acetate
4. washwashed with saturated sodium chloride solution
5. dry with materialdried over sodium sulfate
6. customAfter evaporating under vacuum
7. customthe crude product obtained
8. customis purified by chromatography on a column of silica
9. washeluted with a 90/10 heptane/ethyl acetate mixture