Potassium Carbonate → HCID 21873663, compound

HRID 1992266Notes

Reaction equation

HRID 1992266 reaction equation
Br[C:2]1[CH:3]=[CH:4][C:5]2[O:6][CH2:7][C:8](=[O:12])[NH:9][C:10]=2[N:11]=1.[C:13]1(/[CH:19]=[CH:20]/B(O)O)[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1.C(=O)([O-])[O-].[K+].[K+]>O1CCOCC1.O.CCOC(C)=O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH:20](/[C:2]1[CH:3]=[CH:4][C:5]2[O:6][CH2:7][C:8](=[O:12])[NH:9][C:10]=2[N:11]=1)=[CH:19]\[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1

Participants

8

Reactant 3

HCID 11430Potassium CarbonateHCID 5702628Styrylboronic acidHCID 218737726-Bromo-2H-pyrido[3,2-B][1,4]oxazin-3(4H)-one

Product 1

HCID 21873663HCID 21873663, compoundYield 38%

Reagents, catalysts & solvents 4

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolventHCID 8857Ethyl AcetateSolventHCID 312751,4-DioxaneSolvent

Procedure

6-Bromo-4H-pyrido[3,2-b][1,4]oxazin-3-one (6.0 g, 26.3 mmole) and trans-2-phenylvinylboronic acid (3.9 g, 26.3 mmole) were dissolved in 1,4-dioxane (150 mL) and the solution was degassed with argon. (Ph3P)4Pd (230 mg, 0.2 mmole) was added, followed by a solution of potassium carbonate (6.9 g, 50 mmole) in H2O (20 mL). The reaction was heated at reflux under argon overnight, then was cooled to room temperature and diluted with EtOAc (200 mL). The solution was washed sequentially with H2O and brine, dried (Na2SO4), and concentrated in vacuo. The solid residue was purified by flash chromatography on silica gel (5-10% EtOAc/CHCl3) to afford a solid (2.5 g, 38%): MS (ES) m/z253.0 (M+H)+.

Workup

  1. customthe solution was degassed with argon
  2. temperatureThe reaction was heated
  3. temperatureat reflux under argon overnight
  4. washThe solution was washed sequentially with H2O and brine
  5. dry with materialdried (Na2SO4)
  6. concentrationconcentrated in vacuo
  7. customThe solid residue was purified by flash chromatography on silica gel (5-10% EtOAc/CHCl3)

Sources & evidence

ORD record
ord-e03247ef5cc6430a9b53a6db60cedf01
Source dataset
uspto-grants-2010_01
Patent number
US07648980B2

Reaction notes

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