反应详情

To a solution of 5-(2-acetamido-5-methylpyridin-4-yl)-2-bromo-3-furoic acid (10.0 g, 29.6 mmol) in THF (950 mL) at −20° C. was added TEA (4.55 mL, 32.5 mmol) over 20 min. The reaction mixture was allowed to stir for 10 min after addition was complete and then isobutyl carbonochloridate (10.7 g, 88.8 mmol) was added over 10 min. The reaction mixture was allowed to stir for 20 min at −20° C. and was then allowed to warm to rt. A solution of NH3 in THF was added and the reaction mixture was allowed to stir at rt overnight. The mixture was concentrated and the residue was diluted with water and filtered to give 5-(2-acetamido-5-methylpyridin-4-yl)-2-bromo-3-furamide (8.5 g, 85%).

1. additionafter addition
2. stirringto stir for 20 min at −20° C.
3. stirringto stir at rt overnight
4. concentrationThe mixture was concentrated
5. additionthe residue was diluted with water
6. filtrationfiltered