Triethylamine → 7-Bromo-8-chloromethyl-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one

HRID 215811Notes

Reaction equation

HRID 215811 reaction equation
[Br:1][C:2]1[C:11]([CH2:12]O)=[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.C(N(CC)CC)C.CS([Cl:29])(=O)=O.C(OCC)(=O)C>ClCCl.O>[Br:1][C:2]1[C:11]([CH2:12][Cl:29])=[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 8471TriethylamineHCID 8857Ethyl AcetateHCID 31297Methanesulfonyl chlorideHCID 576719517-Bromo-8-hydroxymethyl-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one

Product 1

HCID 576717617-Bromo-8-chloromethyl-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-oneYield 72.3%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6344DichloromethaneSolvent

Procedure

7-Bromo-8-hydroxymethyl-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one (Reference Compound No. 1, 37.5 mg, 0.125 mmol) was dissolved in anhydrous dichloromethane (1 mL), and triethylamine (20.9 μL, 0.150 mmol) and methanesulfonyl chloride (10.7 μL, 0.138 mmol) were added thereto successively. The reaction mixture was stirred at room temperature overnight. Ethyl acetate (10 mL) and water (10 mL) were added to the reaction mixture and partitioned. The organic layer was washed with saturated brine (10 mL), dried over anhydrous magnesium sulfate, and then the solvent was removed under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate) to give the titled reference compound (28.7 mg) as an orange amorphous product. (Yield 72%)

Workup

  1. custompartitioned
  2. washThe organic layer was washed with saturated brine (10 mL)
  3. dry with materialdried over anhydrous magnesium sulfate
  4. customthe solvent was removed under reduced pressure
  5. customThe obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate)

Sources & evidence

ORD record
ord-ce3557e65cce460cbf83f56193f679c4
Source dataset
uspto-grants-2012_06
Patent number
US08193187B2

Reaction notes

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