Sodium borohydride → methyl 8-(1-hydroxyethyl)-2-morpholino-4-oxo-4H-chromene-6-carboxylate

HRID 572727Notes

Reaction equation

[BH4-].[Na+].[C:3]([C:6]1[CH:7]=[C:8]([C:23]([O:25][CH3:26])=[O:24])[CH:9]=[C:10]2[C:15]=1[O:14][C:13]([N:16]1[CH2:21][CH2:20][O:19][CH2:18][CH2:17]1)=[CH:12][C:11]2=[O:22])(=[O:5])[CH3:4]>CO.C(Cl)Cl>[OH:5][CH:3]([C:6]1[CH:7]=[C:8]([C:23]([O:25][CH3:26])=[O:24])[CH:9]=[C:10]2[C:15]=1[O:14][C:13]([N:16]1[CH2:21][CH2:20][O:19][CH2:18][CH2:17]1)=[CH:12][C:11]2=[O:22])[CH3:4]

Participants

Conditions

Temperature: -10 °C

Procedure

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.

Workup

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

Sources & evidence

ORD record: ord-f9e659ad27bb4dc69a40fc92174fcbd1
Source dataset: uspto-grants-2015_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09029374B2

Reaction notes

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