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Potassium Carbonate → 3-Oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazine-6-carbaldehyde

HRID 885678
Notes
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Reaction equation

HRID 885678 reaction equation
[CH:1]([C:9]1[CH:10]=[CH:11][C:12]2[O:13][CH2:14][C:15](=[O:19])[NH:16][C:17]=2[N:18]=1)=CC1C=CC=CC=1.BrC1C=CC2[O:25]CC(=O)NC=2N=1.C1(/C=C/B(O)O)C=CC=CC=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>[O:19]=[C:15]1[CH2:14][O:13][C:12]2[CH:11]=[CH:10][C:9]([CH:1]=[O:25])=[N:18][C:17]=2[NH:16]1
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

9

Reactant 4

HCID 11430Potassium CarbonateHCID 5702628Styrylboronic acidHCID 218737726-Bromo-2H-pyrido[3,2-B][1,4]oxazin-3(4H)-oneHCID 684438466-Styryl-4H-pyrido[3,2-b][1,4]oxazin-3-one

Product 1

HCID 218737373-Oxo-3,4-dihydro-2H-pyrido[3,2-b][1,4]oxazine-6-carbaldehydeYield 43%

Reagents, catalysts & solvents 4

HCID 178418397HCID 178418397, compoundCatalyst
HCID 962WaterSolvent
HCID 8857Ethyl AcetateSolvent
HCID 312751,4-DioxaneSolvent

Procedure

6-Styryl-4H-pyrido[3,2-b][1,4]oxazin-3-one. To a solution of 6-bromo-4H-pyrido[3,2-b][1,4]oxazin-3-one (3.2 g, 14 mmol) in 1,4-dioxane (80 mL) was added trans-2-phenylvinylboronic acid (2.1 g, 14 mmol). After the reaction mixture was degassed with nitrogen, tetrakis(triphenylphosphine)palladium(0) (0.129 g, 0.112 mmol) and a solution of K2CO3 (3.7 g, 27 mmol) in H2O (10.7 mL) were added. The reaction was heated at reflux for 17 h, then cooled to RT, and diluted with EtOAc (300 mL). The organic layer was separated, washed with H2O (300 mL), brine (300 mL), dried (Na2SO4), and concentrated. The solid residue was purified on SiO2 (5-10% EtOAc/CHCl3) to provide 1.5 g (43%) of the title compound as a solid. MS (ESI): exact mass calculated for C15H12N2O2, 252.09; m/z found, 253.2 [M+H]+. 1H NMR (400 MHz, CDCl3): 7.53-7.00 (m, 9H), 4.66 (d, J=6.9, 2H).

Workup

  1. temperatureThe reaction was heated
  2. temperatureat reflux for 17 h
  3. customThe organic layer was separated
  4. washwashed with H2O (300 mL), brine (300 mL)
  5. dry with materialdried (Na2SO4)
  6. concentrationconcentrated
  7. customThe solid residue was purified on SiO2 (5-10% EtOAc/CHCl3)

Sources & evidence

ORD record
ord-ce511edee8a642c5a7a106f18978b347
Source dataset
uspto-grants-2012_08
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08242275B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes