Reaktion #74102

Reaktionsgleichung

Pyridine-4-carbaldehyde

water

Sodium hydride

[(3-cyano-phenyl)-(tetrahydro-pyran-2-yloxy)-methyl]phosphonic acid dimethyl ester

pyridine-4-carbaldehyde

→

3-[(E)-2-Pyridin-4-yl-1-(tetrahydro-pyran-2-yloxy)-vinyl]-benzonitrile

Ausbeute 98.1%

Lösungsmittel

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGthe reaction mixture was stirred at 50° C. for 3 h under nitrogen atmosphere
2. 2
   Sonstigethe solvent (THF) was removed under reduced pressure
3. 3
   ExtraktionThe water layer was extracted with EtOAc (3×100 ml), DCM (1×100 ml)
4. 4
   Trocknenthe organic layers were dried over Na2SO4
5. 5
   SonstigeThe filtrate was evaporated to dryness

Vorschrift

Sodium hydride (2.28 g, 94.98 mmol) was added to a solution of [(3-cyano-phenyl)-(tetrahydro-pyran-2-yloxy)-methyl]phosphonic acid dimethyl ester (20.58 g, 63.3 mmol) in dry THF and the mixture was stirred at room temperature for 15′. Pyridine-4-carbaldehyde (6.78 g, 63.3 mmol) was then added and the reaction mixture was stirred at 50° C. for 3 h under nitrogen atmosphere. In order to affect completion a further addition of pyridine-4-carbaldehyde (0.68 g, 6.33 mmol) was required. Distilled water (40 ml) was slowly poured into the reaction mixture and the solvent (THF) was removed under reduced pressure. The water layer was extracted with EtOAc (3×100 ml), DCM (1×100 ml) and the organic layers were dried over Na2SO4. The filtrate was evaporated to dryness to give the crude product 3-[(E)-2-Pyridin-4-yl-1-(tetrahydro-pyran-2-yloxy)-vinyl]-benzonitrile as a brown oil (19.0 g, 62.10 mmol, 98%).

Quelle