反应详情

温度

-10 °C

Sodium tetrahydroborate (82 mg, 2.16 mmol) was added to a solution of methyl 8-acetyl-2-morpholino-4-oxo-4H-chromene-6-carboxylate (650 mg, 1.96 mmol) in methanol (20 mL) and DCM (10 mL) at −10° C. After 15 min of stirring at −10° C., the reaction mixture was quenched with water (25 mL). The volatiles were removed and the aqueous layer extracted twice with DCM. The combined organics phases were washed with brine, dried over magnesium sulfate and concentrated. The residue was triturated with diethylether and the solid collected by filtration to give methyl 8-(1-hydroxyethyl)-2-morpholino-4-oxo-4H-chromene-6-carboxylate (500 mg, 76%) as a brown solid, which used for the next step without further purification. Mass Spectrum: M+H+ 334.

1. customthe reaction mixture was quenched with water (25 mL)
2. customThe volatiles were removed
3. extractionthe aqueous layer extracted twice with DCM
4. washThe combined organics phases were washed with brine
5. dry with materialdried over magnesium sulfate
6. concentrationconcentrated
7. customThe residue was triturated with diethylether
8. filtrationthe solid collected by filtration