Isobutyl iodide → (3R)-3-ethyl-6-fluoro-4-(4-methoxybenzoyl)-1-isobutyl-3,4-dihydroquinoxalin-2(1H)-one

HRID 898240Notes

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-].[Cs+].[Cs+].C(=O)([O-])[O-].[K+].[K+].I[CH2:38][CH:39]([CH3:41])[CH3:40]>C(#N)C>[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)[N:5]([CH2:38][CH:39]([CH3:41])[CH3:40])[C:4]1=[O:24])[CH3:2]

Participants

Conditions

Temperature: 74 °C

Procedure

To a stirred solution of (3R)-3-ethyl-6-fluoro-4-(4-methoxybenzoyl)-3,4-dihydroquinoxalin-2(1H)-one (see Example 8) (0.25 g, 0.76 mmol) in acetonitrile (6 mL) under nitrogen was added cesium carbonate (0.13 g, 0.40 mmol), potassium carbonate (0.055 g, 0.40 mmol) and 1-iodo-2-methylpropane (0.30 mL, 0.48 g, 2.6 mmol). The mixture was stirred at 74° C. for 12 h. The solvent was then evaporated, and the residue was partitioned between methylene chloride and water. The organic layer was separated, washed with water, dried over magnesium sulfate, and concentrated in vacuo. The product was purified via Biotage Horizon® (SiO2, gradient from 4% EtOAc/hexane to 38% EtOAc/hexane) to yield 0.10 g (35%) of (3R)-3-ethyl-6-fluoro-4-(4-methoxybenzoyl)-1-isobutyl-3,4-dihydroquinoxalin-2(1H)-one.

Workup

customThe solvent was then evaporated
customthe residue was partitioned between methylene chloride and water
customThe organic layer was separated
washwashed with water
dry with materialdried over magnesium sulfate
concentrationconcentrated in vacuo
customThe product was purified via Biotage Horizon® (SiO2, gradient from 4% EtOAc/hexane to 38% EtOAc/hexane)

Sources & evidence

ORD record: ord-2483fd9fc51e49288c66c4fbe821b533
Source dataset: uspto-grants-2008_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07351709B2

Reaction notes

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