反应详情

40 g sodium hydroxide was dissolved in 1000 ml water and 1000 ml 95% ethanol was added. They were mixed. Then, 50 g ethyl (7-methoxy-1-naphthyl)-acetate was added into above-mentioned mixture solution and the mixture solution was stirred for 3 hours at room temperature. The reaction was subsequently stopped and vacuum evaporated to remove ethanol, resulting in brown-red liquid. The liquid was washed with 300 ml×2 ethyl acetate prior to adding 30 ml 95% ethanol into the aqueous layer. The pH was adjusted to 2 by adding concentrated hydrochloric acid in drops with rapid stirring, resulting in a large amount of light brown solid being precipitated. They were filtered and dried to obtain 32 g product with mp of 154-156° C. The content measured by HPLC is 98.48%, and the yield is 72%.

1. additionThey were mixed
2. customvacuum evaporated
3. customto remove ethanol
4. customresulting in brown-red liquid
5. washThe liquid was washed with 300 ml×2 ethyl acetate
6. additionto adding 30 ml 95% ethanol into the aqueous layer
7. additionby adding concentrated hydrochloric acid in drops with rapid stirring
8. customresulting in a large amount of light brown solid being
9. customprecipitated
10. filtrationThey were filtered
11. customdried