Sodium Carbonate → 2-Nitro-5-(thiophen-2-yl)aniline

HRID 62672Notes

Reaction equation

HRID 62672 reaction equation
Br[C:2]1[CH:3]=[CH:4][C:5]([N+:9]([O-:11])=[O:10])=[C:6]([CH:8]=1)[NH2:7].[S:12]1[CH:16]=[CH:15][CH:14]=[C:13]1B(O)O.C(=O)([O-])[O-].[Na+].[Na+]>C1COCC1.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>[N+:9]([C:5]1[CH:4]=[CH:3][C:2]([C:13]2[S:12][CH:16]=[CH:15][CH:14]=2)=[CH:8][C:6]=1[NH2:7])([O-:11])=[O:10]

Participants

8

Reactant 3

HCID 10340Sodium CarbonateHCID 27339602-Thiopheneboronic acidHCID 53147665-Bromo-2-nitroaniline

Product 1

HCID 236564282-Nitro-5-(thiophen-2-yl)anilineYield 115.2%

Reagents, catalysts & solvents 4

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolvent2×HCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
90 °C

Procedure

To a stirred solution of 5-bromo-2-nitroaniline (10.3 g, 47.3 mmol, 1 eq.), thiophen-2-ylboronic acid (9.08 g, 70.9 mmol, 1.5 eq.) and tetrakis(triphenylphosphine)palladium(0) (5.46 g, 4.73 mmol, 0.1 eq.) in THF (150 mL) was added a solution of sodium carbonate (7.27 g, 68.6 mmol, 1.45 eq.) in water (15 mL). The resulting mixture was warmed to 90° C. for 18 h. The reaction was then diluted with EtOAc and water and filtered through Celite. The organic layer was separated and dried over sodium sulfate, filtered and concentrated under reduced pressure. The crude product was purified by column chromatography (silica gel, 2% EtOAc/hexanes) to afford 2-nitro-5-(thiophen-2-yl)aniline (12.0 g, 79% yield).

Workup

  1. filtrationfiltered through Celite
  2. customThe organic layer was separated
  3. dry with materialdried over sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customThe crude product was purified by column chromatography (silica gel, 2% EtOAc/hexanes)

Sources & evidence

ORD record
ord-9b1a7f6520474ec899c8648b97762478
Source dataset
uspto-grants-2016_09
Patent number
US09447030B2

Reaction notes

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