Tetrahydrofuran → 1-[4-(2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazin-7-yl)-phenyl]-ethanone

HRID 1943734Notes

Reaction equation

O1CCCC1.Br[C:7]1[CH:16]=[N:15][C:10]2[O:11][CH2:12][CH2:13][NH:14][C:9]=2[CH:8]=1.[C:17]([C:20]1[CH:25]=[CH:24][C:23](B(O)O)=[CH:22][CH:21]=1)(=[O:19])[CH3:18].C(=O)([O-])[O-].[K+].[K+]>O>[NH:14]1[CH2:13][CH2:12][O:11][C:10]2[N:15]=[CH:16][C:7]([C:23]3[CH:24]=[CH:25][C:20]([C:17](=[O:19])[CH3:18])=[CH:21][CH:22]=3)=[CH:8][C:9]1=2

Participants

Conditions

Temperature: 80 °C

Procedure

To 3 ml of tetrahydrofuran/0.5 ml of distilled water, 7-bromo-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazine (80.0 mg, 0.37 mmol), 4-acetylphenyl boronic acid (71 mg, 0.55 mmol), potassium carbonate (103 mg, 0.74 mmol) and tetrakis triphenylphosphine palladium (21 mg, 0.02 mmol) were added and stirred at 80° C. for 2 hours. After completion of the reaction, the mixture was extracted ethyl acetate, and the combined organic layer was dried over anhydrous sodium sulfate (Na2SO4), filtered and evaporated under reduced pressure. The resulting solid was recrystallized from n-hexane and diethyl ether to obtain 1-[4-(2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazin-7-yl)-phenyl]-ethanone as yellow solid (59 mg, 62%).

Workup

customAfter completion of the reaction
extractionthe mixture was extracted ethyl acetate
dry with materialthe combined organic layer was dried over anhydrous sodium sulfate (Na2SO4)
filtrationfiltered
customevaporated under reduced pressure
customThe resulting solid was recrystallized from n-hexane and diethyl ether

Sources & evidence

ORD record: ord-ceb4452679e34755b7a1d558a2344c34
Source dataset: uspto-grants-2013_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08394792B2

Reaction notes

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