反应详情

4.28 g of methyl 4-chloro-3-nitro-5-[2-(tetrahydro-pyran-2-yloxy)-ethoxy]-benzoate were dissolved in acetone (250 ml), treated at RT with 5.0 g of potassium carbonate, 1.93 of guaiacol and the mixture was heated at reflux for 20 hours. It was poured on to ice-water and extracted with ethyl acetate. The organic phase was washed 3 times with 5% sodium hydroxide solution, then with water, dried over sodium sulphate and finally concentrated on a rotary evaporator. The crude product (6 g) was flash chromatographed on silica gel with hexane/ether (1/1). here was thus obtained the desired methyl 4-(2-methoxy-phenoxy)-3-nitro-5-[2-(tetrahydro-pyran-2-yloxy)-ethoxy]-benzoate as a pale yellow powder.

1. temperaturethe mixture was heated
2. temperatureat reflux for 20 hours
3. extractionextracted with ethyl acetate
4. washThe organic phase was washed 3 times with 5% sodium hydroxide solution
5. dry with materialwith water, dried over sodium sulphate
6. concentrationfinally concentrated on a rotary evaporator
7. customchromatographed on silica gel with hexane/ether (1/1)