Potassium Carbonate → 2-(6-bromo-2-oxo-7-phenyl-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazin-1-yl)acetonitrile

HRID 1509323Notes

Reaction equation

[Br:1][C:2]1[C:3]([C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)=[CH:4][C:5]2[NH:10][C:9](=[O:11])[CH2:8][O:7][C:6]=2[N:12]=1.Br[CH2:20][C:21]#[N:22].C(=O)([O-])[O-].[K+].[K+]>CN(C=O)C.O>[Br:1][C:2]1[C:3]([C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)=[CH:4][C:5]2[N:10]([CH2:20][C:21]#[N:22])[C:9](=[O:11])[CH2:8][O:7][C:6]=2[N:12]=1

Participants

Conditions

Temperature: 50 °C

Procedure

A mixture of 6-bromo-7-phenyl-1H-pyrido[2,3-b][1,4]oxazin-2(3H)-one (0.4 g, 1.311 mmol), 2-bromoacetonitrile (0.472 g, 3.93 mmol) and potassium carbonate (0.544 g, 3.93 mmol) in DMF (4 ml) was stirred at 50° C. for 2 h. The reaction mixture was diluted with water (20 ml) and extracted with dichloromethane (3×20 ml). The combined organic phase was washed with water, brine, dried over sodium sulfate and concentrated to give crude product which was purified by column chromatography (biotage 25 g) eluted with 0-50% ethyl acetate/cyclohexane to afford product (0.19 g) 1H NMR (500 MHz, CDCl3) 7.45-7.50 (m, 3H), 7.4-7.43 (m, 2H), 7.31 (s, 1H), 4.93 (s, 2H), 4.83 (s, 2H).

Workup

extractionextracted with dichloromethane (3×20 ml)
washThe combined organic phase was washed with water, brine
dry with materialdried over sodium sulfate
concentrationconcentrated
customto give crude product which
customwas purified by column chromatography (biotage 25 g)
washeluted with 0-50% ethyl acetate/cyclohexane

Sources & evidence

ORD record: ord-61c0b0cbab7e41c791341c5d515ea3fb
Source dataset: uspto-grants-2015_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09221838B2

Reaction notes

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