Ethyl bromoacetate → {2,5-Dichloro-4-[3-(4-cyclopropyl-3,4-dihydro-2H-quinoxaline-1-carbonyl)-pyridin-4-yloxy]-phenoxy}-acetic acid ethyl ester

HRID 1967037Notes

Reaction equation

HRID 1967037 reaction equation
[CH:1]1([N:4]2[C:13]3[C:8](=[CH:9][CH:10]=[CH:11][CH:12]=3)[N:7]([C:14]([C:16]3[CH:17]=[N:18][CH:19]=[CH:20][C:21]=3[O:22][C:23]3[CH:28]=[C:27]([Cl:29])[C:26]([OH:30])=[CH:25][C:24]=3[Cl:31])=[O:15])[CH2:6][CH2:5]2)[CH2:3][CH2:2]1.[H-].[Na+].Br[CH2:35][C:36]([O:38][CH2:39][CH3:40])=[O:37]>CN(C)C=O>[CH2:39]([O:38][C:36](=[O:37])[CH2:35][O:30][C:26]1[CH:25]=[C:24]([Cl:31])[C:23]([O:22][C:21]2[CH:20]=[CH:19][N:18]=[CH:17][C:16]=2[C:14]([N:7]2[C:8]3[C:13](=[CH:12][CH:11]=[CH:10][CH:9]=3)[N:4]([CH:1]3[CH2:2][CH2:3]3)[CH2:5][CH2:6]2)=[O:15])=[CH:28][C:27]=1[Cl:29])[CH3:40]

Participants

5

Reactant 3

HCID 7748Ethyl bromoacetateHCID 24758Sodium hydrideHCID 53311358(4-Cyclopropyl-3,4-dihydro-2H-quinoxalin-1-yl)-[4-(2,5-dichloro-4-hydroxy-phenoxy)-pyridin-3-yl]-methanone

Product 1

HCID 53311359{2,5-Dichloro-4-[3-(4-cyclopropyl-3,4-dihydro-2H-quinoxaline-1-carbonyl)-pyridin-4-yloxy]-phenoxy}-acetic acid ethyl esterYield 81%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of 0.15 g (0.33 mmol) (4-cyclopropyl-3,4-dihydro-2H-quinoxalin-1-yl)-[4-(2,5-dichloro-4-hydroxy-phenoxy)-pyridin-3-yl]-methanone (Example 57) in 2 mL N,N-dimethylformamide was added 0.016 g (0.37 mmol) sodium hydride (60% dispersion in mineral oil, Aldrich, CAS RN 7646-69-7). The reaction mixture was stirred for 15 min. at room temperature before 0.04 mL (0.36 mmol) ethyl bromoacetate (commercially available, CAS RN 105-36-2) were added. After stirring at room temperature for 3 hours the solution was poured on water and extracted three times with ethyl acetate. The combined organic layers were washed with water and brine, dried over magnesium sulfate, filtered, treated with silica gel and evaporated. The resulting powder was purified by silica gel chromatography using a MPLC system (10 g silica gel column, CombiFlash Companion, Isco Inc.) eluting with a gradient of n-heptane:ethyl acetate (100:0 to 30:70) to give 0.144 g (81%) of the desired compound as a light yellow foam. MS (ESI): m/z=542.123 [M+H]+.

Workup

  1. additionwere added
  2. additionwas poured on water
  3. extractionextracted three times with ethyl acetate
  4. washThe combined organic layers were washed with water and brine
  5. dry with materialdried over magnesium sulfate
  6. filtrationfiltered
  7. additiontreated with silica gel
  8. customevaporated
  9. customThe resulting powder was purified by silica gel chromatography
  10. washeluting with a gradient of n-heptane:ethyl acetate (100:0 to 30:70)

Sources & evidence

ORD record
ord-6b2fd7263c714846b495da590c2a7100
Source dataset
uspto-grants-2013_04
Patent number
US08420647B2

Reaction notes

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