3-Nitrophenylboronic Acid → HCID 23433444, compound

HRID 2294395Notes

Reaction equation

HRID 2294395 reaction equation
[N+:1]([C:4]1[CH:5]=[C:6](B(O)O)[CH:7]=[CH:8][CH:9]=1)([O-:3])=[O:2].Br[C:14]1[CH:20]=[CH:19][C:17]([NH2:18])=[C:16]([F:21])[CH:15]=1.C([O-])([O-])=O.[K+].[K+]>C1(C)C=CC=CC=1.O.CCOC(C)=O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[NH2:18][C:17]1[CH:19]=[CH:20][C:14]([C:6]2[CH:7]=[CH:8][CH:9]=[C:4]([N+:1]([O-:3])=[O:2])[CH:5]=2)=[CH:15][C:16]=1[F:21]

Participants

8

Reactant 3

HCID 16773-Nitrophenylboronic AcidHCID 11430Potassium CarbonateHCID 1230504-Bromo-2-fluoroaniline

Product 1

HCID 23433444HCID 23433444, compound

Reagents, catalysts & solvents 4

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolventHCID 1140TolueneSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
95 °C

Procedure

A mixture of 3-nitrobenzeneboronic acid (0.70 g, 4.2 mmol), 4-bromo-2-fluoroaniline (730 mg, 4.0 mmol), (PPh3)4Pd (93 mg, 0.08 mmol), and K2CO3 (0.69 g, 5.0 mmol) in toluene (20 mL) and water (2 mL) was heated at 95° C. for 16 h and the mixture was diluted with EtOAc (20 mL). The mixture was washed with water (10 mL) and brine (10 mL), concentrated and purified by silica gel chromatography to afford the 4-amino-3-fluoro-3'-nitrobiphenyl (structure 82 of Scheme XXI, where R1 =R3-7 =H, R8 =F) (0.4 g, 41%) as a yellow solid.

Workup

  1. washThe mixture was washed with water (10 mL) and brine (10 mL)
  2. concentrationconcentrated
  3. custompurified by silica gel chromatography

Sources & evidence

ORD record
ord-208abab680c54041a51ee71151468588
Source dataset
uspto-grants-1997_11
Patent number
US05688808

Reaction notes

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