Sodium Carbonate → HCID 44176857, compound

HRID 2090158Notes

Reaction equation

HRID 2090158 reaction equation
Cl[C:2]1[N:7]=[C:6]([NH:8][C:9]2[CH:10]=[C:11]3[C:15](=[CH:16][CH:17]=2)[NH:14][CH:13]=[CH:12]3)[CH:5]=[N:4][CH:3]=1.[N:18]1[CH:23]=[CH:22][C:21](B(O)O)=[CH:20][CH:19]=1.C(=O)([O-])[O-].[Na+].[Na+]>COCCOC.O.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>[N:18]1[CH:23]=[CH:22][C:21]([C:2]2[N:7]=[C:6]([NH:8][C:9]3[CH:10]=[C:11]4[C:15](=[CH:16][CH:17]=3)[NH:14][CH:13]=[CH:12]4)[CH:5]=[N:4][CH:3]=2)=[CH:20][CH:19]=1

Participants

6

Reactant 3

HCID 10340Sodium CarbonateHCID 2734379(Pyridin-4-yl)boronic acidHCID 86652754HCID 86652754, compound

Product 1

HCID 44176857HCID 44176857, compoundYield 31.1%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 18180031Water 1,2-dimethoxyethaneSolvent

Procedure

A mixture of N-(6-chloro-pyrazin-2-yl)-1H-indol-5-amine (0.030 g, 0.123 mmol), pyridine-4-boronic acid (0.018 g, 0.147 mmol), sodium carbonate (0.067 g, 0.615 mmol) and tetrakis(triphenylphosphine)palladium(0) (0.007 g, 0.006 mmol) in DME:water (3:2, 5 mL) was heated at reflux for 20 h. The reaction mixture was concentrated under reduced pressure and the residue obtained was extracted with dichloromethane. The organic layer was washed with water, brine, dried over sodium sulfate and concentrated. The crude product was purified by flash chromatography (5% methanol in CH2Cl2 as eluent) to yield N-(6-pyridin-4-ylpyrazin-2-yl)-1H-indol-5-amine (0.011 g, 31%) as a yellow solid. 1H NMR (CD3OD) δ 8.70-8.68 (d, J=6.17 Hz, 2H), 8.47 (s, 1H), 8.15 (s, 1H), 8.14 (d, J=1.50 Hz, 2H) 7.96 (d, J=1.70 Hz, 1H), 7.45-7.43 (d, J=8.64 Hz, 1H), 7.37-7.35 (dd, J=10.46, 1.83 Hz, 1H), 7.29-7.28 (d, J=3.06 Hz, 1H), 6.49-6.48 (d, J=3.02 Hz, 1H); MS (API-ES/Positive); m/z: 288 (M+H)+.

Workup

  1. temperaturewas heated
  2. temperatureat reflux for 20 h
  3. concentrationThe reaction mixture was concentrated under reduced pressure
  4. customthe residue obtained
  5. extractionwas extracted with dichloromethane
  6. washThe organic layer was washed with water, brine
  7. dry with materialdried over sodium sulfate
  8. concentrationconcentrated
  9. customThe crude product was purified by flash chromatography (5% methanol in CH2Cl2 as eluent)

Sources & evidence

ORD record
ord-d67ff165a41a48518bf93b9974188e85
Source dataset
uspto-grants-2013_05
Patent number
US08436171B2

Reaction notes

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