Ethyl Acetate → Diethyl (7,8-difluoro-3-methyl-3,4-dihydro-2H-[1,4]benzoxazine-4-yl)methylenemalonate

HRID 846331Notes

Reaction equation

[F:1][C:2]1[C:7]([F:8])=[CH:6][CH:5]=[C:4]([NH:9][CH:10]=[C:11]([C:17]([O:19][CH2:20][CH3:21])=[O:18])[C:12]([O:14][CH2:15][CH3:16])=[O:13])[C:3]=1[O:22][CH2:23][CH:24](OS(C1C=CC(C)=CC=1)(=O)=O)[CH3:25].C(=O)([O-])[O-].[K+].[K+].C1OCCOCCOCCOCCOCCOC1.C(OCC)(=O)C>CN(C)C=O.O>[F:8][C:7]1[CH:6]=[CH:5][C:4]2[N:9]([CH:10]=[C:11]([C:17]([O:19][CH2:20][CH3:21])=[O:18])[C:12]([O:14][CH2:15][CH3:16])=[O:13])[CH:24]([CH3:25])[CH2:23][O:22][C:3]=2[C:2]=1[F:1]

Participants

Conditions

Temperature: 80 °C

Procedure

To a solution of 791 mg of the compound obtained in Example 4 in 5 ml of anhydrous N,N-dimethylformamide (hereinafter abbreviated as DMF), 207 mg of potassium carbonate and a catalytic amount of 18-crown-6-ether were added, and the mixture was heated at 80° C. for 8.5 hours. To the mixture were added ethyl acetate and water. The mixture was shaken, and the organic layer was separated. The organic layer was washed with water and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure. The residue was purified through silica gel column chromatography to yield the titled compound as crystals in quantitative yield. The physical data of the product were identical to those of the authentic specimen as described in Reference Example B-1.

Workup

customthe organic layer was separated
washThe organic layer was washed with water
dry with materialdried over anhydrous magnesium sulfate
customThe solvent was removed under reduced pressure
customThe residue was purified through silica gel column chromatography

Sources & evidence

ORD record: ord-4deaa49bbb644a0d9eea7ef8ddafc305
Source dataset: uspto-grants-1992_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05136059

Reaction notes

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