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Sodium Iodide → 5-Ethyl-2-pyridinol

HRID 859732
Notes
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Reaction equation

HRID 859732 reaction equation
C[O:2][C:3]1[CH:8]=[CH:7][C:6]([CH:9]=[CH2:10])=[CH:5][N:4]=1.[Na+].[I-]>CO.[Pd]>[CH2:9]([C:6]1[CH:7]=[CH:8][C:3](=[O:2])[NH:4][CH:5]=1)[CH3:10]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 2

HCID 5238Sodium IodideHCID 230701355-Ethenyl-2-methoxypyridine

Product 1

HCID 193658715-Ethyl-2-pyridinolYield 83%

Reagents, catalysts & solvents 2

HCID 23938PalladiumCatalystHCID 887MethanolSolvent

Conditions

Temperature
65 °C

Procedure

To a solution of 2-methoxy-5-vinyl-pyridine (2 g) in anhydrous MeOH was added Pd/C (10 wt %, 100 mg). The mixture was stirred under H2 atmosphere for 5 hours before it was filtered through a pad of celite. The solvent was removed in vacuo and the residue was taken directly into next step without further purification. The crude product from previous step was dissolved in anhydrous MeCN. To this solution was added NaI (3.3 g, 21.9 mmol) and TMSCI (2.8 mL, 21.9 mmol). The resulting mixture was heated to 65° C. for 5 hours before it was filtered through a pad of celite. The filtrate was concentrated in vacuo and the residue was purified by flash column chromatography to afford the desired product (1.5 g, 83% yield). 1H NMR (300 MHz, CDCl3): δ 1.17 (t, J=7.5 Hz, 3 H), 2.39–2.49 (m, 2 H), 6.50–6.58 (m, 1 H), 7.15 (s, 1 H), 7.35–7.45 (m, 1 H).

Workup

  1. filtrationwas filtered through a pad of celite
  2. customThe solvent was removed in vacuo
  3. customthe residue was taken directly into next step without further purification
  4. dissolutionThe crude product from previous step was dissolved in anhydrous MeCN
  5. filtrationwas filtered through a pad of celite
  6. concentrationThe filtrate was concentrated in vacuo
  7. customthe residue was purified by flash column chromatography

Sources & evidence

ORD record
ord-9923e0ec42be470ea936ae5003bc2c83
Source dataset
uspto-grants-2006_12
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US07151105B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes