Sodium Carbonate → 2-(4'-Ethyl-3-fluorobiphenyl-4-yl)-5-methylthiophene

HRID 1943513Notes

Reaction equation

HRID 1943513 reaction equation
Br[C:2]1[S:3][C:4]([CH3:7])=[CH:5][CH:6]=1.[CH2:8]([C:10]1[CH:15]=[CH:14][C:13]([C:16]2[CH:21]=[CH:20][C:19](B(O)O)=[C:18]([F:25])[CH:17]=2)=[CH:12][CH:11]=1)[CH3:9].C(=O)([O-])[O-].[Na+].[Na+]>C1(C)C=CC=CC=1.C(O)C.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>[CH2:8]([C:10]1[CH:11]=[CH:12][C:13]([C:16]2[CH:21]=[CH:20][C:19]([C:2]3[S:3][C:4]([CH3:7])=[CH:5][CH:6]=3)=[C:18]([F:25])[CH:17]=2)=[CH:14][CH:15]=1)[CH3:9]

Participants

6

Reactant 3

HCID 10340Sodium CarbonateHCID 698312-Bromo-5-methylthiopheneHCID 534025754'-Ethyl-3-fluorobiphenyl-4-boronic acid

Product 1

HCID 581606952-(4'-Ethyl-3-fluorobiphenyl-4-yl)-5-methylthiophene

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 21863594Toluene ethanolSolvent

Procedure

A mixture of 5.0 g (28.2 mmol) of 2-bromo-5-methylthiophene, 7.70 g (28.3 mmol) of 4′-ethyl-3-fluoro-4-biphenylboronic acid, 1.70 g (1.47 mmol) of tetrakis(triphenylphosphine)palladium(0) and 30 ml of 2 N sodium carbonate solution in 90 ml of toluene/ethanol (1:2) is refluxed for 3 h. After cooling, the organic phase is separated off, and the aqueous phase is extracted a number of times with toluene. The combined organic phases are washed with water and sat. sodium chloride solution. The solution is dried using sodium sulfate and evaporated to dryness. The residue is purified by column chromatography (SiO2, n-heptane:toluene=97:3). The further purification is carried out by recrystallisation from ethanol and n-heptane, giving 2-(4′-ethyl-3-fluorobiphenyl-4-yl)-5-methylthiophene as a colourless solid (m.p. 102° C.).

Workup

  1. temperatureis refluxed for 3 h
  2. temperatureAfter cooling
  3. customthe organic phase is separated off
  4. extractionthe aqueous phase is extracted a number of times with toluene
  5. washThe combined organic phases are washed with water and sat. sodium chloride solution
  6. customThe solution is dried
  7. customevaporated to dryness
  8. customThe residue is purified by column chromatography (SiO2, n-heptane:toluene=97:3)
  9. customThe further purification
  10. customis carried out by recrystallisation from ethanol and n-heptane

Sources & evidence

ORD record
ord-05f7bf8fa6664e07a70360f0b33c850a
Source dataset
uspto-grants-2013_03
Patent number
US08394293B2

Reaction notes

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