反应详情

4-Acetoxybenzoic acid (6.2 g) was added to 25 ml of thionyl chloride, and the reaction was conducted under reflux for 10 hours. After excess thionyl chloride was distilled off, 15 ml of pyridine and 90 ml of toluene were added. Two grams of optically active S-(+)-2-pentanol was added dropwise thereto. After the addition, the mixture was heated under reflux for 4 hours, left to cool and diluted with 500 ml of chloroform. The organic layer was washed with dilute hydrochloric acid, a 1N sodium hydroxide aqueous solution and water in this order, and dried with magnesium sulfate. Further, the solvent was evaporated to obtain 2.2 g of a final crude compound.

1. temperatureunder reflux for 10 hours
2. distillationAfter excess thionyl chloride was distilled off
3. addition15 ml of pyridine and 90 ml of toluene were added
4. additionTwo grams of optically active S-(+)-2-pentanol was added dropwise
5. additionAfter the addition
6. temperaturethe mixture was heated
7. temperatureunder reflux for 4 hours
8. waitleft
9. temperatureto cool
10. additiondiluted with 500 ml of chloroform
11. washThe organic layer was washed with dilute hydrochloric acid
12. dry with materiala 1N sodium hydroxide aqueous solution and water in this order, and dried with magnesium sulfate
13. customFurther, the solvent was evaporated