Potassium Carbonate → (E)-2-Methoxy-4-styrylpyridine

HRID 1020553Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1020553
Br[C:2]1[CH:7]=[CH:6][N:5]=[C:4]([O:8][CH3:9])[CH:3]=1.[C:10]1(/[CH:16]=[CH:17]/B(O)O)[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1.C([O-])([O-])=O.[K+].[K+]>CS(C)=O.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[CH3:9][O:8][C:4]1[CH:3]=[C:2](/[CH:17]=[CH:16]/[C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=2)[CH:7]=[CH:6][N:5]=1

Komponenten

6

Edukt 3

HCID 11430Potassium CarbonateHCID 5702628Styrylboronic acidHCID 140623094-Bromo-2-methoxypyridine

Produkt 1

HCID 57950306(E)-2-Methoxy-4-styrylpyridineAusbeute 93 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)KatalysatorHCID 679Dimethyl SulfoxideLösungsmittel

Reaktionsbedingungen

Temperatur
90 °C

Versuchsvorschrift

4-Bromo-2-methoxypyridine (1.85 g, 9.84 mmol), (E)-phenylvinylboronic acid (4.3 g, 30 mmol), K2CO3 (4.0 g, 30 mmol) and PdCl2(dppf) (400 mg, 0.5 mmol) were stirred in DMSO (15 mL) under vacuum for 30 min. The flask was flushed with nitrogen and the mixture was heated to 90° C. for 30 min. Upon cooling, the mixture was diluted with methylene chloride and washed with 5% lithium chloride solution (5×), dried, concentrated, and the residue was purified by flash column chromatography (silica gel, hexanes/ethyl acetate, 97:3 to 75:25) to provide the title compound (1.93 g, 93%) as an orange oil: 1H NMR (300 MHz, CDCl3) δ 8.12 (d, J=5.2 Hz, 1H), 7.51 (m, 2H), 7.40-7.22 (m, 4H), 7.02-6.94 (m, 2H), 6.78 (s, 1H), 3.95 (s, 3H).

Aufarbeitung

  1. customThe flask was flushed with nitrogen
  2. temperatureUpon cooling
  3. additionthe mixture was diluted with methylene chloride
  4. washwashed with 5% lithium chloride solution (5×)
  5. customdried
  6. concentrationconcentrated
  7. customthe residue was purified by flash column chromatography (silica gel, hexanes/ethyl acetate, 97:3 to 75:25)

Quellen und Nachweise

ORD-Eintrag
ord-2d94008731dd400c94878912a8ec3695
Quelldatensatz
uspto-grants-2014_05
Patentnummer
US08716308B2

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