Pyridine → HCID 135621732, compound

Participants

Reaction Steps

A solution of 5-amino-4-(4-fluorophenyl)-1,3-dimethylpyrazole (20.0 g) and pyridine (23.6 mL) in dichloromethane (150 mL) was added dropwise over 30 min to a solution of triphosgene (11.6 g) in dichloromethane (100 mL) under ice-cooling, and the mixture was stirred at room temperature for 2 hrs. The reaction solution was added dropwise to a solution of aluminum chloride (97.5 g) in dichloromethane under ice-cooling, and the mixture was stirred at room temperature for 2 days. After the completion of the reaction, the reaction solution was poured into ice-water. The precipitated crystals were collected by filtration and washed with water to give 7-fluoro-1,3-dimethyl-3H-pyrazolo[3,4-c]isoquinolin-5(4H)-one (13.2 g).

Provenance & Evidence