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Dichloromethane → 2-(2'-Nitrobiphenyl-4-yl)benzo[d]oxazole

HRID 1509640
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 1509640
I[C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=2[N+:14]([O-:16])=[O:15])=[CH:4][CH:3]=1.[O:17]1[C:21]2[CH:22]=[CH:23][CH:24]=[CH:25][C:20]=2[N:19]=[CH:18]1.C(Cl)Cl.C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>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]>[N+:14]([C:9]1[CH:10]=[CH:11][CH:12]=[CH:13][C:8]=1[C:5]1[CH:6]=[CH:7][C:2]([C:18]2[O:17][C:21]3[CH:22]=[CH:23][CH:24]=[CH:25][C:20]=3[N:19]=2)=[CH:3][CH:4]=1)([O-:16])=[O:15]
KomponentenReaktionsbedingungenVersuchsvorschriftAufarbeitungQuellen und NachweiseNotizen zur Reaktion

Komponenten

6

Edukt 4

HCID 6344DichloromethaneHCID 9228BenzoxazoleHCID 11776TriphenylphosphineHCID 6297494'-Iodo-2-nitrobiphenyl

Produkt 1

HCID 1181140332-(2'-Nitrobiphenyl-4-yl)benzo[d]oxazoleAusbeute 54 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 44119782
Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)
Katalysator

Reaktionsbedingungen

Temperatur
60 °C

Versuchsvorschrift

To a three-necked flask equipped with a magnetic stir bar was added 4′-iodo-2-nitrobiphenyl (1.63 g, 5.0 mmol, 1.0 equiv), benzo[d]oxazole (0.72 g, 6.0 mmol, 1.2 equiv), Ag2CO3 (2.76 g, 10.0 mmol, 2.0 eq), Pd(dppf)Cl2.CH2Cl2 (0.20 g, 0.25 mmol, 0.05 eq) and PPh3 (0.13 g, 0.5 mmol, 0.1 eq). The tube was evacuated and back-filled with nitrogen and this evacuation/back-fill procedure was repeated twice. Then solvent CH3CN (25 mL) was added under the protection of nitrogen. The mixture was stirred in an oil bath at a temperature of 55-65° C. for 4 days and then cooled. The solid was filtered off through a pad of celite and washed with ethyl acetate. The filtrate was concentrated under reduced pressure and the residue was purified through column chromatography on silica gel using hexane and ethyl acetate (10:1-5:1) as an eluent to afford the desired product 2-(2′-nitrobiphenyl-4-yl)benzo[d]oxazole (0.85 g in 54% yield). 1H NMR (DMSO-d6, 400 MHz): δ 7.43-7.49 (m, 2H), 7.61-7.63 (m, 2H), 7.66 (d, J=7.6 Hz, 1H), 7.69-7.73 (m, 1H), 7.83-7.87 (m, 3H), 8.08 (d, J=8.8 Hz, 1H), 8.30 (dd, J=8.0, 1.2 Hz, 2H).

Aufarbeitung

  1. customTo a three-necked flask equipped with a magnetic stir bar
  2. customThe tube was evacuated
  3. additionback-filled with nitrogen
  4. additionThen solvent CH3CN (25 mL) was added under the protection of nitrogen
  5. temperaturecooled
  6. filtrationThe solid was filtered off through a pad of celite
  7. washwashed with ethyl acetate
  8. concentrationThe filtrate was concentrated under reduced pressure
  9. customthe residue was purified through column chromatography on silica gel

Quellen und Nachweise

ORD-Eintrag
ord-5efe0f8fcb1640d69de591fff5d225ae
Quelldatensatz
uspto-grants-2015_12
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US09224963B2

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