反应详情

Under an argon atmosphere and in an anhydrous medium, 1 g (5.07 mmol) of the compound obtained in Step C is dissolved in a mixture of 25 ml of N,N-dimethylformamide and 22 ml of methanol; 6.86 g (126.75 mmol) of sodium methanolate and 1.43 g (10.30 mmol) of copper (I) bromide are added at room temperature. The mixture is heated at reflux for 3 hours. After removal of the solvents by evaporation, the residue is taken up in water and ethyl acetate and then filtered over Celite. The organic phase is washed with water, dried over magnesium sulphate and evaporated to yield a solid, which is purified by flash chromatography over silica gel (eluant:petroleum ether/ethyl acetate, 7:3). The title compound is obtained in the form of a brown solid.

1. temperatureThe mixture is heated
2. temperatureat reflux for 3 hours
3. customAfter removal of the solvents
4. customby evaporation
5. filtrationethyl acetate and then filtered over Celite
6. washThe organic phase is washed with water
7. dry with materialdried over magnesium sulphate
8. customevaporated
9. customto yield a solid, which
10. customis purified by flash chromatography over silica gel (eluant:petroleum ether/ethyl acetate, 7:3)