Sodium Bicarbonate → (4-Cyclopropyl-3,4-dihydro-2H-quinoxalin-1-yl)-[4-(2,5-dichloro-4-hydroxymethyl-phenoxy)-pyridin-3-yl]-methanone

HRID 1967034Notes

Reaction equation

HRID 1967034 reaction equation
C[O:2][C:3](=O)[C:4]1[CH:9]=[C:8]([Cl:10])[C:7]([O:11][C:12]2[CH:17]=[CH:16][N:15]=[CH:14][C:13]=2[C:18]([N:20]2[C:29]3[C:24](=[CH:25][CH:26]=[CH:27][CH:28]=3)[N:23]([CH:30]3[CH2:32][CH2:31]3)[CH2:22][CH2:21]2)=[O:19])=[CH:6][C:5]=1[Cl:33].[H-].[Al+3].[Li+].[H-].[H-].[H-].C(=O)(O)[O-].[Na+]>O1CCCC1>[CH:30]1([N:23]2[C:24]3[C:29](=[CH:28][CH:27]=[CH:26][CH:25]=3)[N:20]([C:18]([C:13]3[CH:14]=[N:15][CH:16]=[CH:17][C:12]=3[O:11][C:7]3[CH:6]=[C:5]([Cl:33])[C:4]([CH2:3][OH:2])=[CH:9][C:8]=3[Cl:10])=[O:19])[CH2:21][CH2:22]2)[CH2:31][CH2:32]1

Participants

5

Reactant 3

HCID 516892Sodium BicarbonateHCID 21226445Aluminium lithium hydrideHCID 533121122,5-dichloro-4-[3-(4-cyclopropyl-3,4-dihydro-2H-quinoxaline-1-carbonyl)-pyridin-4-yloxy]-benzoic acid methyl ester

Product 1

HCID 53311273(4-Cyclopropyl-3,4-dihydro-2H-quinoxalin-1-yl)-[4-(2,5-dichloro-4-hydroxymethyl-phenoxy)-pyridin-3-yl]-methanoneYield 26.6%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 0.10 g (0.20 mmol) 2,5-dichloro-4-[3-(4-cyclopropyl-3,4-dihydro-2H-quinoxaline-1-carbonyl)-pyridin-4-yloxy]-benzoic acid methyl ester (Example 27) in 1 mL tetrahydrofuran was added 0.008 g (0.21 mmol) lithium aluminium hydride. The resulting suspension was stirred at room temperature for 2.5 hours, poured on aqueous saturated sodium bicarbonate solution and extracted three times with ethyl acetate. The combined organic layers were washed with brine, dried over magnesium sulfate, filtered, treated with silica gel and evaporated to dryness. The resulting powder was purified by silica gel chromatography using a MPLC system (10 g silica gel column, CombiFlash Companion, Isco Inc.) with a gradient of n-heptane:ethyl acetate (100:0 to 50:50) to give 0.025 g (26%) of the desired compound as a light brown oil. MS (ESI): m/z=470.103 [M+H]+.

Workup

  1. extractionextracted three times with ethyl acetate
  2. washThe combined organic layers were washed with brine
  3. dry with materialdried over magnesium sulfate
  4. filtrationfiltered
  5. additiontreated with silica gel
  6. customevaporated to dryness
  7. customThe resulting powder was purified by silica gel chromatography

Sources & evidence

ORD record
ord-f37bdcf307dc4b5f8159771d56cc3119
Source dataset
uspto-grants-2013_04
Patent number
US08420647B2

Reaction notes

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