反应详情

A solution of the compound obtained in Step A (3.24 mmoles) in pyridine (99 mmol) is stirred at 90° C. for 2 hours. The reaction mixture is cooled to ambient temperature and then filtered. The solid obtained is washed with ethanol and dried in vacuo at 50° C. The compound is dissolved in MeOH (80 mL), and 0.434 mmol of potassium carbonate is added. The mixture is stirred at 80° C. for 5 hours. After cooling to ambient temperature, 4M HCl/dioxane solution is added (pH 3) and the mixture is evaporated to dryness. The residue obtained is triturated in water, filtered, washed with water and then dried in vacuo at 50° C. to yield the title product.

1. filtrationfiltered
2. customThe solid obtained
3. washis washed with ethanol
4. customdried in vacuo at 50° C
5. dissolutionThe compound is dissolved in MeOH (80 mL)
6. temperatureAfter cooling to ambient temperature
7. customthe mixture is evaporated to dryness
8. customThe residue obtained
9. customis triturated in water
10. filtrationfiltered
11. washwashed with water
12. customdried in vacuo at 50° C.