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Citric Acid → Tert-butyl 4-(2-nitrophenyl)-2-(5-phenylpyridine-3-carboxamido)benzoate

HRID 454748
Notes
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Reaction equation

HRID 454748 reaction equation
C(=O)([O-])[O-].[Na+].[Na+].[N+:7]([C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][C:11]=1B(O)O)([O-:9])=[O:8].Br[C:20]1[CH:32]=[CH:31][C:23]([C:24]([O:26][C:27]([CH3:30])([CH3:29])[CH3:28])=[O:25])=[C:22]([NH:33][C:34]([C:36]2[CH:37]=[N:38][CH:39]=[C:40]([C:42]3[CH:47]=[CH:46][CH:45]=[CH:44][CH:43]=3)[CH:41]=2)=[O:35])[CH:21]=1.C(O)(=O)CC(CC(O)=O)(C(O)=O)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.C(OCC)(=O)C.COCCOC.O>[N+:7]([C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][C:11]=1[C:20]1[CH:32]=[CH:31][C:23]([C:24]([O:26][C:27]([CH3:29])([CH3:28])[CH3:30])=[O:25])=[C:22]([NH:33][C:34]([C:36]2[CH:37]=[N:38][CH:39]=[C:40]([C:42]3[CH:47]=[CH:46][CH:45]=[CH:44][CH:43]=3)[CH:41]=2)=[O:35])[CH:21]=1)([O-:9])=[O:8]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

9

Reactant 4

HCID 311Citric AcidHCID 10340Sodium Carbonate2×HCID 2773548(2-Nitrophenyl)boronic acid2×HCID 58508430Tert-butyl 4-bromo-2-(5-phenylpyridine-3-carboxamido)benzoate

Product 1

HCID 58508723Tert-butyl 4-(2-nitrophenyl)-2-(5-phenylpyridine-3-carboxamido)benzoateYield 62.2%

Reagents, catalysts & solvents 4

HCID 178418397HCID 178418397, compoundCatalyst2×HCID 962WaterSolventHCID 80711,2-DimethoxyethaneSolventHCID 8857Ethyl AcetateSolvent

Procedure

Water (0.6 mL), sodium carbonate (70 mg), 2-nitrophenylboronic acid (44 mg), and tetrakis(triphenylphosphine)palladium(0) (13 mg) were added to an ethylene glycol dimethyl ether (2.0 mL) solution of tert-butyl 4-bromo-2-(5-phenylpyridine-3-carboxamido)benzoate (0.10 g), followed by heating to reflux under a nitrogen atmosphere for 2 hours and 30 minutes. The reaction mixture was cooled to room temperature, and then sodium carbonate (23 mg), 2-nitrophenylboronic acid (37 mg), and tetrakis(triphenylphosphine)palladium(0) (13 mg) were added thereto, followed by heating to reflux under a nitrogen atmosphere for 2 hours and 50 minutes. The reaction mixture was cooled to room temperature, and a 10% aqueous solution of citric acid and ethyl acetate were added thereto. The organic layer was separated, washed with a saturated aqueous solution of sodium chloride, and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The obtained residue was purified by silica gel column chromatography [Fuji Silysia Chemical Ltd., PSQ100B (spherical), eluent: 91-80% hexane/ethyl acetate] to obtain 68 mg of tert-butyl 4-(2-nitrophenyl)-2-(5-phenylpyridine-3-carboxamido)benzoate as a light green solid.

Workup

  1. temperatureby heating
  2. temperatureto reflux under a nitrogen atmosphere for 2 hours and 30 minutes
  3. temperatureby heating
  4. temperatureto reflux under a nitrogen atmosphere for 2 hours and 50 minutes
  5. temperatureThe reaction mixture was cooled to room temperature
  6. customThe organic layer was separated
  7. washwashed with a saturated aqueous solution of sodium chloride
  8. dry with materialdried over anhydrous magnesium sulfate
  9. customthe solvent was evaporated under reduced pressure
  10. customThe obtained residue was purified by silica gel column chromatography [Fuji Silysia Chemical Ltd., PSQ100B (spherical), eluent: 91-80% hexane/ethyl acetate]

Sources & evidence

ORD record
ord-2e9d2ca718dc4d50bc725eae421755fe
Source dataset
uspto-grants-2013_07
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08492582B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes