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

HRID 1509640Notes

Reaction equation

HRID 1509640 reaction equation
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]

Participants

6

Reactant 4

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

Product 1

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

Reagents, catalysts & solvents 1

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)Catalyst

Conditions

Temperature
60 °C

Procedure

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).

Workup

  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

Sources & evidence

ORD record
ord-5efe0f8fcb1640d69de591fff5d225ae
Source dataset
uspto-grants-2015_12
Patent number
US09224963B2

Reaction notes

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