4-Pyridinecarboxaldehyde → HCID 53658794, compound

Participants

Reaction Steps

A mixture of 3-(2,5-dimethoxyphenyl)butyl triphenylphosphonium bromide (19.0 g., 35.4 mmoles) in dimethylsulfoxide (50 ml.) is added to 4-pyridinecarboxaldehyde (3.79 g., 35.4 mmoles) in tetrahydrofuran (40 ml.). The resulting mixture is then added dropwise to a slurry of 50% sodium hydride (1.87 g., 39 mmoles) in tetrahydrofuran (20 ml.) under a nitrogen atmosphere at 0°-5° C. Following completion of addition, the mixture is stirred for one hour at 0°-5° and then concentrated under reduced pressure. The concentrate is diluted with water (200 ml.) and then acidified with 6 N HCl. The aqueous acid solution is extracted with benzene (4×50 ml.). It is then made basic and extracted with ethyl acetate (3×50 ml.). Evaporation of the combined extracts after drying (MgSO4) affords 4-(2,5-dimethoxyphenyl)-1-(4-pyridyl)-1-pentene.

Provenance & Evidence