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Hydrochloric Acid → 3-Chloro-6-phenyl-2-pyridylmethanol

HRID 349972
Notes
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Reaction equation

HRID 349972 reaction equation
C([Li])(C)(C)C.[Cl:6][C:7]1[CH:8]=[CH:9][C:10]([C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)=[N:11][CH:12]=1.Cl.[C:20](=O)(O)[O-:21].[Na+]>O1CCCC1.CN(C)C=O>[Cl:6][C:7]1[C:12]([CH2:20][OH:21])=[N:11][C:10]([C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)=[CH:9][CH:8]=1
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 516892Sodium BicarbonateHCID 27628665-Chloro-2-phenylpyridineHCID 178418306HCID 178418306, compound

Product 1

HCID 230249223-Chloro-6-phenyl-2-pyridylmethanolYield 43%

Reagents, catalysts & solvents 2

HCID 6228
Dimethylformamide
Solvent
HCID 8028TetrahydrofuranSolvent

Procedure

tert-Butyl Lithium (1.7M pentane solution, 15 ml) was added slowly to a solution of 5-chloro-2-phenylpyridine (4.70 g) in tetrahydrofuran (50 ml) at −78° C. under a nitrogen atmosphere, which was stirred for 1 hour. N,N-Dimethylformamide (2.3 ml) was added to the mixture slowly, which was stirred for 1 hour while raising the temperature to room temperature. After addition of dilute hydrochloric acid the mixture was stirred at room temperature for 30 minutes. The reaction mixture was neutralized with saturated aqueous sodium bicarbonate solution, which was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated aqueous sodium chloride solution, dried (MgSO4), and concentrated. Sodium borohydride (946 mg) was added slowly to a mixture of the residue, tetrahydrofuran (50 ml) and methanol (50 ml) at room temperature, which was stirred for 1 hour. The reaction mixture was poured into water, which was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated aqueous sodium chloride solution, dried (MgSO4), and concentrated. The residue was subjected to silica gel column chromatography to obtain 3-chloro-6-phenyl-2-pyridylmethanol (2.35 g, yield 43%) as pale yellow crystals from the fraction eluted with ethyl acetate-hexane (1:6, volume ratio). This was recrystallized from ethyl acetate-hexane. Melting point: 69–70° C.

Workup

  1. stirringwhich was stirred for 1 hour
  2. stirringwas stirred at room temperature for 30 minutes
  3. extractionwas extracted with ethyl acetate
  4. washThe ethyl acetate layer was washed with saturated aqueous sodium chloride solution
  5. dry with materialdried (MgSO4)
  6. concentrationconcentrated
  7. additionSodium borohydride (946 mg) was added slowly to a mixture of the residue, tetrahydrofuran (50 ml) and methanol (50 ml) at room temperature
  8. stirringwhich was stirred for 1 hour
  9. additionThe reaction mixture was poured into water, which
  10. extractionwas extracted with ethyl acetate
  11. washThe ethyl acetate layer was washed with saturated aqueous sodium chloride solution
  12. dry with materialdried (MgSO4)
  13. concentrationconcentrated

Sources & evidence

ORD record
ord-efdfbd0f6ef44ffbb5bde9b7d5c0abc2
Source dataset
uspto-grants-2007_02
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US07179823B1

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes