Sodium hydride → 2-(3-Cyano-3-(3,4-dichlorophenyl)propyl)oxytetrahydropyran

HRID 975079Notes

Reaction equation

HRID 975079 reaction equation
[H-].[Na+].[Cl:3][C:4]1[CH:5]=[C:6]([CH2:11][C:12]#[N:13])[CH:7]=[CH:8][C:9]=1[Cl:10].Br[CH2:15][CH2:16][O:17][CH:18]1[CH2:23][CH2:22][CH2:21][CH2:20][O:19]1.[Cl-].[NH4+]>O1CCCC1.O>[Cl:3][C:4]1[CH:5]=[C:6]([CH:11]([CH2:15][CH2:16][O:17][CH:18]2[CH2:23][CH2:22][CH2:21][CH2:20][O:19]2)[C:12]#[N:13])[CH:7]=[CH:8][C:9]=1[Cl:10]

Participants

7

Reactant 4

HCID 24758Sodium hydrideHCID 25517Ammonium ChlorideHCID 76690(3,4-Dichlorophenyl)acetonitrileHCID 866212-(2-Bromoethoxy)tetrahydro-2H-pyran

Product 1

HCID 156708072-(3-Cyano-3-(3,4-dichlorophenyl)propyl)oxytetrahydropyran

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent3×

Procedure

Twenty-two grams of a 55-60% dispersion of sodium hydride in oil are suspended in 200 ml of dry tetrahydrofuran. A solution of 85 g of 3,4-dichlorophenylacetonitrile in 500 ml of tetrahydrofuran is added dropwise at 20° C. over 30 minutes and the reaction mixture is then stirred at room temperature for about two hours. A solution of 98 grams of 2-bromoethoxytetrahydropyran in 100 ml of tetrahydrofuran is added to the reaction mixture cooled to -20° C., the mixture is allowed to warm up to room temperature, and, after two hours, a solution of 50 grams of ammonium chloride in three liters of water is added. Extraction is carried out with 1.5 liters of ethyl ether and the extract is washed with a saturated solution of sodium chloride, decanted, dried over magnesium sulfate, and concentrated under vacuum. The residue is chromatographed on silica gel using dichloromethane as the eluent. The pure product fractions are concentrated to give 3,4-dichloro-α-(2tetrahydropyranyloxyethyl)benzeneacetonitrile as an oil.

Workup

  1. temperaturecooled to -20° C.
  2. temperatureto warm up to room temperature
  3. waitafter two hours
  4. extractionExtraction
  5. washthe extract is washed with a saturated solution of sodium chloride
  6. customdecanted
  7. dry with materialdried over magnesium sulfate
  8. concentrationconcentrated under vacuum
  9. customThe residue is chromatographed on silica gel
  10. concentrationThe pure product fractions are concentrated

Sources & evidence

ORD record
ord-605d563c4d9445cf8c26d6b24e72e092
Source dataset
uspto-grants-1997_03
Patent number
US05607947

Reaction notes

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