3,4-dihydro-2H-pyran → 3-Hydroxy-4-(3-tetrahydropyranyloxypropyl)pyridine

HRID 1841573Notes

Reaction equation

HRID 1841573 reaction equation
[OH:1][C:2]1[CH:3]=[N:4][CH:5]=[CH:6][C:7]=1[CH2:8][CH2:9][CH2:10][OH:11].[O:12]1[CH:17]=[CH:16][CH2:15][CH2:14][CH2:13]1.C(=O)([O-])O.[Na+]>C1COCC1>[OH:1][C:2]1[CH:3]=[N:4][CH:5]=[CH:6][C:7]=1[CH2:8][CH2:9][CH2:10][O:11][CH:13]1[CH2:14][CH2:15][CH2:16][CH2:17][O:12]1

Participants

5

Reactant 3

HCID 80803,4-dihydro-2H-pyranHCID 516892Sodium BicarbonateHCID 23506216HCID 23506216, compound

Product 1

HCID 696798943-Hydroxy-4-(3-tetrahydropyranyloxypropyl)pyridine

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

3-(3-Hydroxypyridin-4-yl)-1-propanol (1.00 g, 6.53 mmol) obtained in Example 62 is dissolved in THF, and thereto are added dihydropyrane (5.0 ml, 55 mmol), D,L-camphore-10-sulfonic acid (1.00 g, 4.30 mmol), and the mixture is heated under reflux for 20 minutes. The reaction solution is poured into an aqueous sodium hydrogen carbonate solution, and the mixture is extracted with ethyl acetate (200 ml×2), dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue is purified by silica gel column chromatography (eluent: hexane/ethyl acetate) to give 3-hydroxy-4-(3-tetrahydropyranyloxypropyl)pyridine as colorless oil.

Workup

  1. temperaturethe mixture is heated
  2. temperatureunder reflux for 20 minutes
  3. extractionthe mixture is extracted with ethyl acetate (200 ml×2)
  4. dry with materialdried over anhydrous magnesium sulfate
  5. concentrationconcentrated under reduced pressure
  6. customThe residue is purified by silica gel column chromatography (eluent: hexane/ethyl acetate)

Sources & evidence

ORD record
ord-9b8ad9b6e66b487186243fb11bc04f0b
Source dataset
uspto-grants-2004_01
Patent number
US06683186B2

Reaction notes

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