Ethyl Acetate → 3-{[(1S)-1-methyl-2-(methyloxy)ethyl]oxy}-5-[(3-methyl-4-oxo-3,4-dihydro-2H-1,3-benzoxazin-7-yl)oxy]benzoic acid

HRID 548733Notes

Reaction equation

[OH:1][C:2]1[CH:3]=[C:4]([CH:8]=[C:9]([O:11][C@@H:12]([CH3:16])[CH2:13][O:14][CH3:15])[CH:10]=1)[C:5]([OH:7])=[O:6].F[C:18]1[CH:29]=[CH:28][C:21]2[C:22](=[O:27])[N:23]([CH3:26])[CH2:24][O:25][C:20]=2[CH:19]=1.C(=O)([O-])[O-].[K+].[K+].C(OCC)(=O)C>C(#N)C>[CH3:16][C@H:12]([O:11][C:9]1[CH:8]=[C:4]([CH:3]=[C:2]([O:1][C:18]2[CH:29]=[CH:28][C:21]3[C:22](=[O:27])[N:23]([CH3:26])[CH2:24][O:25][C:20]=3[CH:19]=2)[CH:10]=1)[C:5]([OH:7])=[O:6])[CH2:13][O:14][CH3:15]

Participants

Conditions

Temperature: 160 °C

Procedure

A mixture of 3-hydroxy-5-{[(1S)-1-methyl-2-(methyloxy)ethyl]oxy}benzoic acid (175 mg, 0.77 mmol), 7-fluoro-3-methyl-2,3-dihydro-4H-1,3-benzoxazin-4-one (141 mg, 0.77 mmol) and potassium carbonate (321 mg, 2.32 mmol) in acetonitrile (5 mL) was stirred in a microwave reactor at 160° C. for 16 hours then reduced in vacuo and ethyl acetate (50 mL) added. The mixture was washed with water (50 mL), the aqueous layer acidified with 1M citric acid and extracted into ethyl acetate (2×50 mL). The combined organics were washed with brine (50 mL), dried (MgSO4), and reduced in vacuo to give the desired compound as a brown oil (0.24 g). m/z 453 (M+H)+

Workup

additionadded
washThe mixture was washed with water (50 mL)
extractionextracted into ethyl acetate (2×50 mL)
washThe combined organics were washed with brine (50 mL)
dry with materialdried (MgSO4)

Sources & evidence

ORD record: ord-7289c0bf0d314bc6a67209bf47df9aed
Source dataset: uspto-grants-2011_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07943607B2

Reaction notes

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