反应详情

温度

30 °C

522 mg of the product of Example 6 and 20 ml of methanol were mixed together and the solution was heated to 30° C., then returned to ambient temperature 2 ml of 2N sodium hydroxide were added and the reaction medium stood for 4 hours and 30 minutes, then was poured into 30 ml of water and adjusted to pH 2-3. Extraction was carried out 3 times with ethyl acetate and the organic phase was washed with water, then with salt water, dried and purified on silica with methylene chloride-methanol 9-1 as eluant. Then, solidification was carried out by trituration in 0.2 ml of isopropanol and 5 ml of ether to obtain 345 mg of the expected product (white crystals) melting at 151°-152° C.

1. customreturned to ambient temperature
2. additionwere added
3. extractionExtraction
4. washthe organic phase was washed with water
5. dry with materialwith salt water, dried
6. custompurified on silica with methylene chloride-methanol 9-1 as eluant