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

HRID 454755Notes

Reaction equation

HRID 454755 reaction equation
[S:1]1[CH:5]=[CH:4][CH:3]=[C:2]1B(O)O.C(=O)([O-])[O-].[Na+].[Na+].Br[C:16]1[CH:28]=[CH:27][C:19]([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])=[C:18]([NH:29][C:30]([C:32]2[CH:33]=[N:34][CH:35]=[C:36]([C:38]3[CH:43]=[CH:42][CH:41]=[CH:40][CH:39]=3)[CH:37]=2)=[O:31])[CH:17]=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>[C:38]1([C:36]2[CH:37]=[C:32]([C:30]([NH:29][C:18]3[CH:17]=[C:16]([C:2]4[S:1][CH:5]=[CH:4][CH:3]=4)[CH:28]=[CH:27][C:19]=3[C:20]([O:22][C:23]([CH3:25])([CH3:26])[CH3:24])=[O:21])=[O:31])[CH:33]=[N:34][CH:35]=2)[CH:39]=[CH:40][CH:41]=[CH:42][CH:43]=1

Participants

9

Reactant 4

HCID 311Citric AcidHCID 10340Sodium CarbonateHCID 27339602-Thiopheneboronic acidHCID 58508430Tert-butyl 4-bromo-2-(5-phenylpyridine-3-carboxamido)benzoate

Product 1

HCID 58508694Tert-butyl 2-(5-phenylpyridine-3-carboxamido)-4-(thiophen-2-yl)benzoate

Reagents, catalysts & solvents 4

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

Procedure

Water (0.60 mL), 2-thiopheneboronic acid (34 mg), sodium carbonate (70 mg), and tetrakis(triphenylphosphine)palladium(0) (13 mg) were added to an ethylene glycol dimethyl ether (2.0 mL) suspension 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. The reaction mixture was cooled to room temperature, and then ethyl acetate and a 10% aqueous solution of citric acid 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 [Kanto Chemical Co., Inc., silica gel 60 (spherical), eluent: 95-85% hexane/ethyl acetate] to obtain tert-butyl 2-(5-phenylpyridine-3-carboxamido)-4-(thiophen-2-yl)benzoate.

Workup

  1. temperatureby heating
  2. temperatureto reflux under a nitrogen atmosphere for 2 hours
  3. customThe organic layer was separated
  4. washwashed with a saturated aqueous solution of sodium chloride
  5. dry with materialdried over anhydrous magnesium sulfate
  6. customthe solvent was evaporated under reduced pressure
  7. customThe obtained residue was purified by silica gel column chromatography [Kanto Chemical Co., Inc., silica gel 60 (spherical), eluent: 95-85% hexane/ethyl acetate]

Sources & evidence

ORD record
ord-7ca5df04d2334338860906c4ff360394
Source dataset
uspto-grants-2013_07
Patent number
US08492582B2

Reaction notes

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