反应详情

To a solution of Example 19A (13.41 g, 43.8 mmol) in methanol (231 mL) was added hydroxylamine hydrochloride (15.22 g, 219 mmol) to give a thick slurry. The mixture was treated with a solution of sodium hydroxide (8.76 g, 219 mmol) in water (58 mL), heated at reflux for two hours, cooled and concentrated to a paste. The paste was treated with 100-150 mL of water and stirred for 15 minutes to give a solid that was collected by filtration, washed with water and dried to constant mass to give the title compound as a powder (11.86 g, 84%). MS (ESI+) m/z 321/323 (M+H)+.

1. customto give a thick slurry
2. temperatureheated
3. temperatureat reflux for two hours
4. temperaturecooled
5. concentrationconcentrated to a paste
6. additionThe paste was treated with 100-150 mL of water
7. customto give a solid
8. filtrationthat was collected by filtration
9. washwashed with water
10. customdried to constant mass