反应详情

To a solution of the compound obtained in Step A (100 g) in dichloromethane (5 ml/g) there are added 2 equivalents of thionyl chloride (126.35 g). The mixture is heated to reflux and maintained at reflux for 2 hours. After returning to ambient temperature, the solvent is evaporated off under reduced pressure. The oil obtained is taken up in ethyl acetate and washed with water and then with saturated NaCl solution. The solvent is evaporated off under reduced pressure and the crude product is purified by passing over a pad of silica (eluant: heptane). The title compound is obtained in the form of a yellow solid in a yield of 84%.

1. temperatureThe mixture is heated
2. temperatureto reflux
3. temperaturemaintained
4. temperatureat reflux for 2 hours
5. customAfter returning to ambient temperature
6. customthe solvent is evaporated off under reduced pressure
7. customThe oil obtained
8. washwashed with water
9. customThe solvent is evaporated off under reduced pressure
10. customthe crude product is purified