Ethyl Acetate → methyl 3-[(3-methyl-4-oxo-3,4-dihydro-2H-1,3-benzoxazin-7-yl)oxy]-5-[(3S)-tetrahydrofuran-3-yloxy]benzoate

HRID 548735Notes

Reaction equation

[OH:1][C:2]1[CH:3]=[C:4]([CH:9]=[C:10]([O:12][C@H:13]2[CH2:17][CH2:16][O:15][CH2:14]2)[CH:11]=1)[C:5]([O:7][CH3:8])=[O:6].F[C:19]1[CH:30]=[CH:29][C:22]2[C:23](=[O:28])[N:24]([CH3:27])[CH2:25][O:26][C:21]=2[CH:20]=1.C(=O)([O-])[O-].[K+].[K+].C(OCC)(=O)C>C(#N)C>[CH3:27][N:24]1[C:23](=[O:28])[C:22]2[CH:29]=[CH:30][C:19]([O:1][C:2]3[CH:3]=[C:4]([CH:9]=[C:10]([O:12][C@H:13]4[CH2:17][CH2:16][O:15][CH2:14]4)[CH:11]=3)[C:5]([O:7][CH3:8])=[O:6])=[CH:20][C:21]=2[O:26][CH2:25]1

Participants

Conditions

Temperature: 160 °C

Procedure

A mixture of methyl 3-hydroxy-5-[(3S)-tetrahydrofuran-3-yloxy]benzoate (184 mg, 0.77 mmol), 7-fluoro-3-methyl-2,3-dihydro-4H-1,3-benzoxazin-4-one (140 mg, 0.77 mmol) and potassium carbonate (214 mg, 1.54 mmol) in acetonitrile (5 mL) was stirred in a microwave reactor at 160° C. for 10 hours then reduced in vacuo and ethyl acetate (50 mL) added. The organics were washed with brine (50 mL), dried (MgSO4), and reduced in vacuo and the crude oil purified by chromatography on silica, eluting with 30%-80% ethyl acetate in isohexane, to give the desired compound as a colourless oil (0.12 g).

Workup

additionadded
washThe organics were washed with brine (50 mL)
dry with materialdried (MgSO4)
customthe crude oil purified by chromatography on silica
washeluting with 30%-80% ethyl acetate in isohexane

Sources & evidence

ORD record: ord-d69d1368e58643e6a4cb1ea3eb09a20b
Source dataset: uspto-grants-2011_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07943607B2

Reaction notes

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