反应详情

TSTU (6.55 g, 21.74 mmol) was added to a stirred solution of 8-bromo-2-morpholino-4-oxo-4H-chromene-6-carboxylic acid (7 g, 19.77 mmol) and DIPEA (3.79 mL, 21.74 mmol) dissolved in DCM (100 mL) under nitrogen. The resulting suspension was stirred at room temperature for 4 h. More TSTU (6.55 g, 21.74 mmol) and DIPEA (3.79 mL, 21.74 mmol) were added and stirring was pursued for a further 16 h. The reaction mixture was quenched with a saturated aqueous solution of sodium hydrogencarbonate and extracted with DCM and a little MeOH. The combined organic phases were dried over MgSO4, concentrated and purified by flash chromatography on silica gel eluting with 3 to 5% MeOH in DCM. The solvent was evaporated to dryness to afford 8-bromo-N,N-dimethyl-2-morpholino-4-oxo-4H-chromene-6-carboxamide (7.70 g, 102%) as a beige solid. Mass Spectrum: m/z [M+H]+=381.

1. stirringstirring
2. waitwas pursued for a further 16 h
3. customThe reaction mixture was quenched with a saturated aqueous solution of sodium hydrogencarbonate
4. extractionextracted with DCM
5. dry with materialThe combined organic phases were dried over MgSO4
6. concentrationconcentrated
7. custompurified by flash chromatography on silica gel eluting with 3 to 5% MeOH in DCM
8. customThe solvent was evaporated to dryness