(5-Bromo-3-pyridinyl)methanol → 6-[5-(hydroxymethyl)pyrid-3-yl]-N-phenylimidazo[1,2-a]pyridine-2-carboxamide

HRID 2363696Notes

Reaction equation

HRID 2363696 reaction equation
C[Sn](C)(C)[C:3]1[CH:4]=[CH:5][C:6]2[N:7]([CH:9]=[C:10]([C:12]([NH:14][C:15]3[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=3)=[O:13])[N:11]=2)[CH:8]=1.Br[C:24]1[CH:25]=[C:26]([CH2:30][OH:31])[CH:27]=[N:28][CH:29]=1>[Pd].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.CN(C)C=O>[OH:31][CH2:30][C:26]1[CH:25]=[C:24]([C:3]2[CH:4]=[CH:5][C:6]3[N:7]([CH:9]=[C:10]([C:12]([NH:14][C:15]4[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=4)=[O:13])[N:11]=3)[CH:8]=2)[CH:29]=[N:28][CH:27]=1

Participants

5

Reactant 2

HCID 2784733(5-Bromo-3-pyridinyl)methanolHCID 441359416-trimethylstannyl-N-phenylimidazo[1,2-a]pyridine-2-carboxamide2×

Product 1

HCID 687806576-[5-(hydroxymethyl)pyrid-3-yl]-N-phenylimidazo[1,2-a]pyridine-2-carboxamideYield 43.5%

Reagents, catalysts & solvents 2

HCID 11979704Tetrakis(triphenylphosphine)palladiumCatalystHCID 6228DimethylformamideSolvent

Procedure

163 mg of 6-trimethylstannyl-N-phenylimidazo[1,2-a]pyridine-2-carboxamide (Intermediate 4), 310 mg of (5-bromopyrid-3-yl)methanol, 66 mg of tetrakis(triphenylphosphine)-palladium and 4 mL of N,N-dimethylformamide are placed in a microwave tube. The reaction mixture is heated for 20 minutes in a microwave machine set at 150° C. and concentrated to dryness. The residue is chromatographed on a silica cartridge, eluting with dichloromethane. The fractions containing the expected product are combined and evaporated to dryness under reduced pressure to give 61 mg of 6-[5-(hydroxymethyl)pyrid-3-yl]-N-phenylimidazo[1,2-a]pyridine-2-carboxamide in the form of a white solid.

Workup

  1. temperatureThe reaction mixture is heated for 20 minutes in a microwave machine
  2. customset at 150° C.
  3. concentrationconcentrated to dryness
  4. customThe residue is chromatographed on a silica cartridge
  5. washeluting with dichloromethane
  6. additionThe fractions containing the expected product
  7. customevaporated to dryness under reduced pressure

Sources & evidence

ORD record
ord-84843b68228e4fc48db2843be8c4db7f
Source dataset
uspto-grants-2014_04
Patent number
US08691990B2

Reaction notes

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