Triethylamine → HCID 59635506, compound

Participants

Reaction Conditions

Reaction Steps

To 5-chloropyrazolo[1,5-a]pyrimidine-3-carbaldehyde (590 mg, 3.25 mmol) in DMF was added 5-Carboxythiophene-2-boronic acid (670 mg, 3.9 mmol), triethylamine (1.13 mL, 8.11 mmol) and dichloro-((bis-diphenylphosphino)ferrocenyl)palladium(II) dichloromethane adduct (120 mg, 0.16 mmol). The reaction mixture was degassed with nitrogen then heated at 100° C. for 2 hours. The mixture was cooled to room temperature, diluted with 1N HCl, and filtered. The collected solid was washed with 1N HCl and dried under vacuum. The desired product, 5-(3-formylpyrazolo[1,5-a]pyrimidin-5-yl)thiophene-2-carboxylic acid, was recovered in 22% yield and used for the next step without further purification. LCMS (M+1=274)

Provenance & Evidence