Citric Acid → N-[3,5-Bis(trifluoromethyl)phenyl]-2-hydroxy-5-[(trimethylsilyl)ethynyl]benzamide

HRID 2384357Notes

Reaction equation

HRID 2384357 reaction equation
[F:1][C:2]([F:25])([F:24])[C:3]1[CH:4]=[C:5]([NH:13][C:14](=[O:23])[C:15]2[CH:20]=[C:19](I)[CH:18]=[CH:17][C:16]=2[OH:22])[CH:6]=[C:7]([C:9]([F:12])([F:11])[F:10])[CH:8]=1.[CH3:26][Si:27]([C:30]#[CH:31])([CH3:29])[CH3:28].C(OCC)(=O)C.C(O)(=O)CC(CC(O)=O)(C(O)=O)O>C(N(CC)CC)C.CN(C)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>[F:1][C:2]([F:25])([F:24])[C:3]1[CH:4]=[C:5]([NH:13][C:14](=[O:23])[C:15]2[CH:20]=[C:19]([C:31]#[C:30][Si:27]([CH3:29])([CH3:28])[CH3:26])[CH:18]=[CH:17][C:16]=2[OH:22])[CH:6]=[C:7]([C:9]([F:12])([F:11])[F:10])[CH:8]=1

Participants

8

Reactant 4

HCID 311Citric AcidHCID 8857Ethyl AcetateHCID 66111TrimethylsilylacetyleneHCID 11190699N-[3,5-bis(trifluoromethyl)phenyl]-2-hydroxy-5-iodo-benzamide

Product 1

HCID 10343463N-[3,5-Bis(trifluoromethyl)phenyl]-2-hydroxy-5-[(trimethylsilyl)ethynyl]benzamideYield 32.1%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 6228DimethylformamideSolventHCID 8471TriethylamineSolvent

Conditions

Temperature
40 °C

Procedure

N-[3,5-Bis(trifluoromethyl)phenyl]-2-hydroxy-5-iodobenzamide (950 mg, 2 mmol) and trimethylsilylacetylene (246 mg, 2.5 mmol) were dissolved in triethylamine (2 mL) and N,N-dimethylformamide (4 mL). Tetrakis(triphenylphosphine)palladium(23 mg, 0.02 mmol) and cuprous iodide (4 mg, 0.02 mmol) were added under argon atmosphere, and the mixture was stirred at 40° C. for 2 hours. After cooling to room temperature, the reaction mixture was poured into ethyl acetate (100 mL) and 1 N citric acid (100 mL), stirred, and filtered through celite. After the ethyl acetate layer was washed with water and brine one after another, dried over anhydrous magnesium sulfate, the solvent was evaporated under reduced pressure. The obtained residue was purified by column chromatography on silica gel (n-hexane:ethyl acetate=19:1) to give a light orange solid. This was crystallized by n-hexane to give the title compound (286 mg, 32.1%) as a white crystal.

Workup

  1. temperatureAfter cooling to room temperature
  2. stirringstirred
  3. filtrationfiltered through celite
  4. washAfter the ethyl acetate layer was washed with water and brine one after another,
  5. dry with materialdried over anhydrous magnesium sulfate
  6. customthe solvent was evaporated under reduced pressure
  7. customThe obtained residue was purified by column chromatography on silica gel (n-hexane:ethyl acetate=19:1)
  8. customto give a light orange solid
  9. customThis was crystallized by n-hexane

Sources & evidence

ORD record
ord-b0552c05667f4b7ba958673329362e92
Source dataset
uspto-grants-2012_09
Patent number
US08263657B2

Reaction notes

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