Boron tribromide → (E)-3-(4-((6-hydroxy-2-(4-(trifluoromethyl)phenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylic acid

HRID 332892Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 332892
C[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(C)(C)C)=[O:21])=[CH:14][CH:13]=3)=[C:9]([C:27]3[CH:32]=[CH:31][C:30]([C:33]([F:36])([F:35])[F:34])=[CH:29][CH:28]=3)[S:8][C:7]=2[CH:37]=1.B(Br)(Br)Br>C(Cl)Cl>[OH: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]([OH:22])=[O:21])=[CH:14][CH:13]=3)=[C:9]([C:27]3[CH:32]=[CH:31][C:30]([C:33]([F:36])([F:34])[F:35])=[CH:29][CH:28]=3)[S:8][C:7]=2[CH:37]=1

Komponenten

4

Edukt 2

HCID 25134Boron tribromideHCID 86730641(E)-tert-butyl 3-(4-((6-methoxy-2-(4-(trifluoromethyl)phenyl)benzo[b]thiophen-3 yl)oxy)phenyl)acrylate

Produkt 1

HCID 78322700(E)-3-(4-((6-hydroxy-2-(4-(trifluoromethyl)phenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylic acidAusbeute 66 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344DichloromethaneLösungsmittel

Reaktionsbedingungen

Temperatur
0 °C

Versuchsvorschrift

To a 2-dram vial containing (E)-tert-butyl 3-(4-((6-methoxy-2-(4-(trifluoromethyl)phenyl)benzo[b]thiophen-3 yl)oxy)phenyl)acrylate (59.4 mg, 0.113 mmol) in anhydrous DCM (1.5 mL) at 0° C. was added BBr3 (1.0 M in DCM, 451 μL, 0.451 mmol) dropwise. The resulting mixture was stirred at 0° C. for 1 h after which the reaction was quenched with 3 drops of water, diluted with DCM, and extracted with sat. aq. NaHCO3 (added a few drops of 2-propanol). The organic layer was dried over anhydrous MgSO4, filtered concentrated in vacuo to afford the crude material which was purified by reverse phase HPLC (neutral condition, 3% 1-propanol in 10-100% CH3CN/H2O) to afford (E)-3-(4-((6-hydroxy-2-(4-(trifluoromethyl)phenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylic acid (33.8 mg, 0.074 mmol, 66% yield) as a white solid. 1H NMR (400 MHz, CD3OD) δ ppm=6.36 (d, J=16.17 Hz, 1H), 6.78-6.89 (m, 1H), 6.98 (d, J=8.59 Hz, 2H), 7.17-7.30 (m, 2H), 7.51-7.70 (m, 5H), 7.88 (d, J=8.08 Hz, 2H). HRMS (m/z, MH+): 457.0710.

Aufarbeitung

  1. customwas quenched with 3 drops of water
  2. additiondiluted with DCM
  3. extractionextracted with sat. aq. NaHCO3 (added a few drops of 2-propanol)
  4. dry with materialThe organic layer was dried over anhydrous MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo
  7. customto afford the crude material which
  8. customwas purified by reverse phase HPLC (neutral condition, 3% 1-propanol in 10-100% CH3CN/H2O)

Quellen und Nachweise

ORD-Eintrag
ord-c34edcd3f34e4888b726932a6f942e58
Quelldatensatz
uspto-grants-2014_11
Patentnummer
US08877801B2

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