Potassium Carbonate → {3-Ethyl-6-methoxy-5-[2-methoxy-4-(trifluoromethoxy)phenyl]pyrazin-2-yl} [(4-methoxyphenyl)methyl]amine

HRID 889874Notes

Reaction equation

HRID 889874 reaction equation
Br[C:2]1[C:3]([NH:23][CH2:24][C:25]2[CH:30]=[CH:29][C:28]([O:31][CH3:32])=[CH:27][CH:26]=2)=[N:4][C:5]([O:21][CH3:22])=[C:6]([C:8]2[CH:13]=[CH:12][C:11]([O:14][C:15]([F:18])([F:17])[F:16])=[CH:10][C:9]=2[O:19][CH3:20])[N:7]=1.[CH2:33](B(O)O)[CH3:34].C(=O)([O-])[O-].[K+].[K+]>C1(C)C=CC=CC=1.[OH-].[Na+].C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:33]([C:2]1[C:3]([NH:23][CH2:24][C:25]2[CH:30]=[CH:29][C:28]([O:31][CH3:32])=[CH:27][CH:26]=2)=[N:4][C:5]([O:21][CH3:22])=[C:6]([C:8]2[CH:13]=[CH:12][C:11]([O:14][C:15]([F:18])([F:17])[F:16])=[CH:10][C:9]=2[O:19][CH3:20])[N:7]=1)[CH3:34]

Participants

7

Reactant 3

HCID 11430Potassium CarbonateHCID 521157Ethylboronic acidHCID 23594996{3-Bromo-6-methoxy-5-[2-methoxy-4-(trifluoromethoxy)phenyl]pyrazin-2-yl} [(4-methoxyphenyl)methyl]amine

Product 1

HCID 22248943{3-Ethyl-6-methoxy-5-[2-methoxy-4-(trifluoromethoxy)phenyl]pyrazin-2-yl} [(4-methoxyphenyl)methyl]amineYield 92.8%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 1140TolueneSolventHCID 14798Sodium HydroxideSolvent

Conditions

Temperature
85 °C

Procedure

To a stirred solution of {3-bromo-6-methoxy-5-[2-methoxy-4-(trifluoromethoxy) phenyl]pyrazin-2-yl }[(4-methoxyphenyl)methyl]amine (514 mg, 1.0 mmol) and ethylboronic acid (219 mg, 3.0 mmol) in toluene (8 mL) is added tetrakis(triphenylphosphine)palladium(0) (50 mg) and potassium carbonate (2.0 M, 1.0 mL). The mixture is heated to 85° C. for 8 h, cooled to room temperature, diluted with 2.0 M sodium hydroxide and extracted twice with 1:1 hexane-ethyl ether. The combined extracts are dried (sodium sulfate), filtered and concentrated. The residue is purified by flash chromatography, eluting with 20% ether in hexanes to give {3-ethyl-6-methoxy-5-[2-methoxy-4-(trifluoromethoxy) phenyl]pyrazin-2-yl }[(4-methoxyphenyl)methyl]amine (430 mg).

Workup

  1. temperaturecooled to room temperature
  2. extractionextracted twice with 1:1 hexane-ethyl ether
  3. dry with materialThe combined extracts are dried (sodium sulfate)
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe residue is purified by flash chromatography
  7. washeluting with 20% ether in hexanes

Sources & evidence

ORD record
ord-b8eb183c88a74c40a93ee9f51e6112ad
Source dataset
uspto-grants-2006_02
Patent number
US06995161B2

Reaction notes

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