反应详情

To a cold (0° C.) solution of tert-butyl 2-amino-4-(3-aminophenyl)-6-(2-hydroxyphenyl)nicotinate (starting compound 6, 0.626 g, 1.659 mmol) in THF (7 mL) including pyridine (0.148 mL, 1.824 mmol) was added a solution of 5-oxotetrahydro-2-furancarbonyl chloride (0.271 g, 1.824 mmol) in THF (3 mL). After 1 hr., the mixture was allowed to warm to room temperature and the stirring was continued for 2 hrs. The mixture was partitioned between ethyl acetate and water. The separated organic phase was washed with brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified by column chromatography on silica-gel (hexane:ethyl acetate, 1:4-1:19) to give tert-butyl 2-amino-6-(2-hydroxyphenyl)-4-(3-{[(5-oxotetrahydro-2-furanyl)carbonyl]amino}-phenyl)-nicotinate as a pale yellow foam (0.677 g, yield 83%).

1. waitthe stirring was continued for 2 hrs
2. customThe mixture was partitioned between ethyl acetate and water
3. washThe separated organic phase was washed with brine
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by column chromatography on silica-gel (hexane:ethyl acetate, 1:4-1:19)