Tetrahydrofuran → 2,6-Difluoro-3-[2-(4-fluorophenyl)pyrazolo[1,5-a]pyridin-5-yl]benzaldehyde

Participants

Reaction Steps

The procedure described in stage 2.4 is followed, starting with 0.300 g (1.03 mmol) of 5-bromo-2-(4-fluorophenyl)pyrazolo[1,5-a]pyridine obtained in stage 2.3, 0.210 g (1.13 mmol) of 2,4-difluoro-3-formylphenylboronic acid, 1.00 g (3.09 mmol) of caesium carbonate and 0.084 g (0.10 mmol) of [1,1′-bis(diphenylphosphino)ferrocene]-dichloropalladium(II) in 5 ml of a 9/1 mixture of tetrahydrofuran and water. After chromatography on silica gel, elution being carried out with a mixture of cyclohexane and ethyl acetate (8/2), 0.278 g (76%) of the expected product is obtained in the fowl of a beige powder.

Provenance & Evidence