Nitrogen → 2-Bromo-4'-tert-butylbiphenyl

HRID 1778624

Reaktionsgleichung

Reaktionsgleichung von HRID 1778624
C(=O)([O-])[O-].[K+].[K+].[Br:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=1B(O)O.Br[C:18]1[CH:23]=[CH:22][C:21]([C:24]([CH3:27])([CH3:26])[CH3:25])=[CH:20][CH:19]=1.N#N.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>C([O-])(=O)C.[Pd+2].C([O-])(=O)C.COCCOC.O>[Br:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=1[C:18]1[CH:23]=[CH:22][C:21]([C:24]([CH3:27])([CH3:26])[CH3:25])=[CH:20][CH:19]=1

Komponenten

9

Edukt 5

HCID 947NitrogenHCID 11430Potassium CarbonateHCID 11776TriphenylphosphineHCID 775951-Bromo-4-tert-butylbenzeneHCID 2773294(2-Bromophenyl)boronic acid

Produkt 1

HCID 580672832-Bromo-4'-tert-butylbiphenylAusbeute 55,1 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 167845palladium(II) acetateKatalysatorHCID 962WaterLösungsmittelHCID 80711,2-DimethoxyethaneLösungsmittel

Reaktionsbedingungen

Temperatur
85 °C

Versuchsvorschrift

To a 250-mL round bottom flask equipped with a magnetic stir bar was added water (41 mL) and 1,2-dimethoxyethane (41 mL). The solution was sparged with nitrogen for 20 minutes, then potassium carbonate (6.49 g, 46.9 mmol, 3 equiv), 2-bromophenylboronic acid (3.69 g, 18.4 mmol, 0.98 equiv) and 1-bromo-4-tert-butylbenzene (4.00 g, 18.8 mmol, 1 equiv) were added. the flask was then purged with N2 for 10 minutes before finally adding palladium(II) acetate (84 mg, 0.375 mmol, 0.02 equiv) and triphenylphosphine (394 mg, 1.50 mmol, 0.08 equiv). The reaction mixture was heated to 85° C. under a positive pressure of nitrogen for 18 hours. After cooling to room temperature, the phases were partitioned and the organic layer was collected. The aqueous layer was washed with ethyl acetate (3×20 mL). The combined organic fractions were washed with brine (50 mL), dried over sodium sulfate, filtered, and concentrated on a rotary evaporator. The crude yellow oil was purified by column chromatography on an Isco CombiFlash system (120-g column, eluted with 14 column volumes heptane) to afford the title compound as a colorless oil (2.93 g, 67 area % by HPLC, 54% yield). 1H NMR (400 MHz, CDCl3) δ ppm 7.68-7.64 (m, 1H), 7.48-7.42 (m, 2H), 7.39-7.31 (m, 4H), 7.21-7.15 (m, 1H), 1.39 (s, 9H).

Aufarbeitung

  1. customTo a 250-mL round bottom flask equipped with a magnetic stir bar
  2. customThe solution was sparged with nitrogen for 20 minutes
  3. temperatureAfter cooling to room temperature
  4. customthe phases were partitioned
  5. customthe organic layer was collected
  6. washThe aqueous layer was washed with ethyl acetate (3×20 mL)
  7. washThe combined organic fractions were washed with brine (50 mL)
  8. dry with materialdried over sodium sulfate
  9. filtrationfiltered
  10. concentrationconcentrated on a rotary evaporator
  11. customThe crude yellow oil was purified by column chromatography on an Isco CombiFlash system (120-g column, eluted with 14 column volumes heptane)

Quellen und Nachweise

ORD-Eintrag
ord-1a8b3d0a67ea4c9db388874acba17894
Quelldatensatz
uspto-grants-2016_02
Patentnummer
US09266913B2

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