反应详情

4.4 ml (76 mmol) of absolute ethanol are added dropwise at room temperature to a suspension of 2.29 g (76 mmol) of sodium hydride (80% strength) in 30 ml of absolute tetrahydrofuran and the mixture is stirred for 30 minutes. A solution of 2.7 g (7.6 mmol) of the compound from Example 86 are then added dropwise in 20 ml of absolute tetrahydrofuran and the mixture is heated overnight under reflux. The reaction batch is subsequently poured onto ice water and, after the pH has been adjusted to 8, extracted several times using ether. The organic phase is washed with sodium chloride solution, dried over sodium sulphate, concentrated and chromatographed over silica gel (eluent ethyl acetate/petroleum ether 5195).

1. temperaturethe mixture is heated overnight
2. temperatureunder reflux
3. additionThe reaction batch is subsequently poured onto ice water
4. extractionextracted several times
5. washThe organic phase is washed with sodium chloride solution
6. dry with materialdried over sodium sulphate
7. concentrationconcentrated
8. customchromatographed over silica gel (eluent ethyl acetate/petroleum ether 5195)