反应详情

温度

180 °C

In a 100-ml, four-necked flask equipped with a mechanical stirrer, a reflux condenser and a thermometer were placed 21.6 g (0.1 mole) of the 2-(4-methoxybenzylidene)cyclohexanone produced in Example 8 and 51.7 g (0.3 mole) of diethyl maleate in this order. The flask inside was purged with nitrogen. Thereto was added 2.2 g (10 wt. %, 1.0 mmole as palladium) of 5% palladium carbon (a product of Wako Pure Chemical Industries, Ltd.). The mixture was stirred at 180° C. for 6 hours and cooled to room temperature. 200 ml of toluene was added to the system. Filtration was conducted to remove the palladium carbon. The filtrate was extracted with 150 ml of a 7% aqueous sodium hydroxide solution, and this operation was repeated twice. The aqueous layer was washed with 50 ml of toluene. To the resulting aqueous layer was added 35% hydrochloric acid until the aqueous layer became acidic, after which the aqueous layer was extracted with 150 ml of ethyl acetate. The ethyl acetate layer was washed with water and a saturated aqueous sodium chloride solution in this order. The ethyl acetate layer was dried over anhydrous sodium sulfate and then subjected to vacuum distillation to remove ethyl acetate, to obtain 13.3 g of light yellow crystals. Yield: 62% The purity of the intended product in the crystals was 97% as measured by high performance liquid chromatography.

1. customIn a 100-ml, four-necked flask equipped with a mechanical stirrer, a reflux condenser
2. customThe flask inside was purged with nitrogen
3. temperaturecooled to room temperature
4. filtrationFiltration
5. customto remove the palladium carbon
6. extractionThe filtrate was extracted with 150 ml of a 7% aqueous sodium hydroxide solution
7. washThe aqueous layer was washed with 50 ml of toluene
8. additionTo the resulting aqueous layer was added 35% hydrochloric acid until the aqueous layer
9. extractionafter which the aqueous layer was extracted with 150 ml of ethyl acetate
10. washThe ethyl acetate layer was washed with water
11. dry with materialThe ethyl acetate layer was dried over anhydrous sodium sulfate
12. distillationsubjected to vacuum distillation
13. customto remove ethyl acetate