Iodoethane → (3R)-1,3-diethyl-6-fluoro-4-(4-methoxybenzoyl)-3,4-dihydroquinoxalin-2(1H)-one

HRID 898229Notes

Reaction equation

HRID 898229 reaction equation
[CH2:1]([C@H:3]1[N:12]([C:13](=[O:22])[C:14]2[CH:19]=[CH:18][C:17]([O:20][CH3:21])=[CH:16][CH:15]=2)[C:11]2[C:6](=[CH:7][CH:8]=[C:9]([F:23])[CH:10]=2)[NH:5][C:4]1=[O:24])[CH3:2].C(=O)([O-])[O-].[K+].[K+].C(=O)([O-])[O-].[Cs+].[Cs+].I[CH2:38][CH3:39]>C(#N)C>[CH2:38]([N:5]1[C:6]2[C:11](=[CH:10][C:9]([F:23])=[CH:8][CH:7]=2)[N:12]([C:13](=[O:22])[C:14]2[CH:19]=[CH:18][C:17]([O:20][CH3:21])=[CH:16][CH:15]=2)[C@H:3]([CH2:1][CH3:2])[C:4]1=[O:24])[CH3:39]

Participants

6

Reactant 4

HCID 6340IodoethaneHCID 10796Cesium carbonateHCID 11430Potassium CarbonateHCID 69223657(3R)-3-ethyl-6-fluoro-4-(4-methoxybenzoyl)-3,4-dihydroquinoxalin-2(1H)-one

Product 1

HCID 69221429(3R)-1,3-diethyl-6-fluoro-4-(4-methoxybenzoyl)-3,4-dihydroquinoxalin-2(1H)-oneYield 96.6%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Conditions

Temperature
50 °C

Procedure

To a stirred solution of (3R)-3-ethyl-6-fluoro-4-(4-methoxybenzoyl)-3,4-dihydroquinoxalin-2(1H)-one (0.20 g, 0.61 mmol) in acetonitrile (5 mL) under nitrogen was added potassium carbonate (0.050 g, 0.36 mmol), cesium carbonate (0.11 g, 0.33 mmol) and iodoethane (0.15 mL, 0.29 g, 1.9 mmol). The reaction was stirred for 10 h at 50° C. and then 5 h at 63° C. The solvent was evaporated, and the residue was partitioned between ethyl acetate and water. The layers were separated and the organic layer was washed with water. The organic layer was concentrated in vacuo and purified via Biotage Horizon® (SiO2, gradient from 5% EtOAc/hexane to 33% EtOAc/hexane) to yield 0.21 g (96%) of (3R)-1,3-diethyl-6-fluoro-4-(4-methoxybenzoyl)-3,4-dihydroquinoxalin-2(1H)-one. MS (ESI) m/z 357 ([M+H]+); HRMS: calcd for C20H21FN2O3, 356.16090; found (ESI+), 357.16057.

Workup

  1. custom5 h
  2. customat 63° C
  3. customThe solvent was evaporated
  4. customthe residue was partitioned between ethyl acetate and water
  5. customThe layers were separated
  6. washthe organic layer was washed with water
  7. concentrationThe organic layer was concentrated in vacuo
  8. custompurified via Biotage Horizon® (SiO2, gradient from 5% EtOAc/hexane to 33% EtOAc/hexane)

Sources & evidence

ORD record
ord-dbf43c6a8c704971853871ea2f93ad39
Source dataset
uspto-grants-2008_04
Patent number
US07351709B2

Reaction notes

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