Tributylphosphine → 7-Bromo-8-(5-fluoro-2-methylphenoxymethyl)-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one

HRID 215812Notes

Reaction equation

HRID 215812 reaction equation
[Br:1][C:2]1[C:11]([CH2:12][OH:13])=[C:10]2[C:5]([NH:6][C:7]([CH3:17])([CH3:16])[C:8](=[O:15])[N:9]2[CH3:14])=[CH:4][CH:3]=1.[F:18][C:19]1[CH:20]=[CH:21][C:22]([CH3:26])=[C:23](O)[CH:24]=1.C(P(CCCC)CCCC)CCC.N(C(N1CCCCC1)=O)=NC(N1CCCCC1)=O>O1CCCC1.CCCCCC>[Br:1][C:2]1[C:11]([CH2:12][O:13][C:21]2[CH:20]=[C:19]([F:18])[CH:24]=[CH:23][C:22]=2[CH3:26])=[C:10]2[C:5]([NH:6][C:7]([CH3:17])([CH3:16])[C:8](=[O:15])[N:9]2[CH3:14])=[CH:4][CH:3]=1

Participants

7

Reactant 4

HCID 13831Tributylphosphine2×HCID 730421,1'-(Azodicarbonyl)dipiperidine2×HCID 27746165-Fluoro-2-methylphenol2×HCID 576719517-Bromo-8-hydroxymethyl-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one

Product 1

HCID 247811517-Bromo-8-(5-fluoro-2-methylphenoxymethyl)-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-oneYield 82.1%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8058HexaneSolvent

Procedure

A mixture of 7-bromo-8-hydroxymethyl-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one (Reference Compound No. 1, 805 mg, 2.69 mmol), 5-fluoro-2-methylphenol (382 μL, 3.50 mmol), and tri-n-butylphosphine (874 μL, 3.50 mmol) was dissolved in anhydrous tetrahydrofuran (25 mL), 1,1′-(azodicarbonyl)dipiperidine (883 mg, 3.50 mmol) was added thereto, and then the mixture was stirred at room temperature for 1 hour. 5-Fluoro-2-methylphenol (382 μL, 3.50 mmol), tri-n-butylphosphine (874 μL, 3.50 mmol), and 1,1′-(azodicarbonyl)dipiperidine (890 mg, 3.53 mmol) were added thereto and it was furthermore stirred for 20 minutes. After hexane (15 mL) was added to the reaction mixture and the precipitated solids were filtered out, the filtrate was concentrated under reduced pressure and the obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate) to give the titled reference compound (900 mg) as a colorless solid. (Yield 82%)

Workup

  1. stirringit was furthermore stirred for 20 minutes
  2. filtrationthe precipitated solids were filtered out
  3. concentrationthe filtrate was concentrated under reduced pressure
  4. customthe obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate)

Sources & evidence

ORD record
ord-b786b73a291641a18fecbaa98a4978b9
Source dataset
uspto-grants-2012_06
Patent number
US08193187B2

Reaction notes

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