Pivalic acid → (E)-methyl 3-(4-((2-(2-isopropylphenyl)-6-methoxybenzo[b]thiophen-3-yl)oxy)phenyl)acrylate

HRID 632685Notes

Reaction equation

HRID 632685 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[CH:5][C:6]2[C:10]([O:11][C:12]3[CH:17]=[CH:16][C:15](/[CH:18]=[CH:19]/[C:20](=[O:22])C)=[CH:14][CH:13]=3)=[CH:9][S:8][C:7]=2[CH:23]=1.I[C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][C:26]=1[CH:31]([CH3:33])[CH3:32].CC(C)(C)[C:36](O)=[O:37].C(=O)([O-])[O-].[K+].[K+]>CC(N(C)C)=O.CCOC(C)=O>[CH:31]([C:26]1[CH:27]=[CH:28][CH:29]=[CH:30][C:25]=1[C:9]1[S:8][C:7]2[CH:23]=[C:3]([O:2][CH3:1])[CH:4]=[CH:5][C:6]=2[C:10]=1[O:11][C:12]1[CH:17]=[CH:16][C:15](/[CH:18]=[CH:19]/[C:20]([O:37][CH3:36])=[O:22])=[CH:14][CH:13]=1)([CH3:33])[CH3:32]

Participants

7

Reactant 4

HCID 6417Pivalic acidHCID 11430Potassium CarbonateHCID 87931o-IodocumeneHCID 118574934(E)-4-(4-((6-methoxybenzo [b]thiophen-3-yl)oxy)phenyl)but-3-en-2-one

Product 1

HCID 86730642(E)-methyl 3-(4-((2-(2-isopropylphenyl)-6-methoxybenzo[b]thiophen-3-yl)oxy)phenyl)acrylateYield 77.7%

Reagents, catalysts & solvents 2

HCID 8857Ethyl AcetateSolventHCID 31374DimethylacetamideSolvent

Conditions

Temperature
140 °C

Procedure

To a solution of (E)-4-(4-((6-methoxybenzo[b]thiophen-3-yl)oxy)phenyl)but-3-en-2-one (45 g, 132 mmol) in anhydrous DMA (450 mL) at room temperature was added 1-iodo-2-isopropylbenzene (57 g, 231.6 mmol), chloro[2-(dicyclohexylphosphino)-3,6-dimethoxy-2′,4′,6′-tri-i-propyl-1,1′-biphenyl][2-(2-aminoethyl)phenyl]palladium(II) (BrettPhos Palladacycle 1st generation, 6.34 g, 7.93 mmol), trimethylacetic acid (40.5 g, 397 mmol) and potassium carbonate (55 g, 397 mmol). The resulting mixture was heated at 140° C. for 1.5 hours. The reaction mixture was cooled down to 50° C. The reaction was diluted with EtOAc (400 mL) and let to cool down to room temperature. As the reaction cooled, a precipitate formed and was removed by filtration. The mother liquor was washed with water and brine, dried over anhydrous Na2SO4, filtered and concentrated in vacuo to give the crude product, which was purified by column chromatography (SiO2, 10-20% EtOAc/heptane) to afford (E)-methyl 3-(4-((2-(2-isopropylphenyl)-6-methoxybenzo[b]thiophen-3-yl)oxy)phenyl)acrylate (47 g, 102.5 mmol). 1H NMR (400 MHz, CDCl3) δ ppm=7.61 (d, J=15.9 Hz, 1H), 7.42-7.29 (m, 7H), 7.15 (ddd, J=8.1, 5.7, 2.8 Hz, 1H), 6.97 (dd, J=8.8, 2.3 Hz, 1H), 6.91-6.85 (m, 2H), 6.29 (d, J=16.0 Hz, 1H), 3.91 (s, 3H), 3.80 (s, 3H), 3.26 (p, J=6.8 Hz, 1H), 1.19 (d, J=6.9 Hz, 6H), LC/MS (m/z, MH+): 459.5.

Workup

  1. temperatureThe reaction mixture was cooled down to 50° C
  2. temperatureto cool down to room temperature
  3. temperatureAs the reaction cooled
  4. customa precipitate formed
  5. customwas removed by filtration
  6. washThe mother liquor was washed with water and brine
  7. dry with materialdried over anhydrous Na2SO4
  8. filtrationfiltered
  9. concentrationconcentrated in vacuo
  10. customto give the crude product, which
  11. customwas purified by column chromatography (SiO2, 10-20% EtOAc/heptane)

Sources & evidence

ORD record
ord-7c697243bc054170a42e26e96cc30eb3
Source dataset
uspto-grants-2016_04
Patent number
US09321746B2

Reaction notes

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