Phosphorus oxychloride → 8-Chloro-3-(1-methylpiperidin-4-yl)imidazo[1,5-a]pyrazine

Participants

Reaction Conditions

Reaction Steps

To a solution of N-((3-chloropyrazin-2-yl)methyl)-1-methylpiperidine-4-carboxamide (6.51 mmol, 1.75 g) in acetonitrile (10 ml) was added phosphorus oxychloride (65.1 mmol, 6.36 ml) and this solution was heated at 80° C. for four hours. The reaction mixture was concentrated in vacuo and coevaporated with toluene. The residue was cooled in an ice bath and quenched with 7N ammonia in methanol (50 ml) and dichloromethane (50 ml). The solids were removed by filtration and the filtrate was concentrated. To the residue dichloromethane (50 ml) and of 7N ammonia in methanol (1 ml) was added. After 10 minutes at room temperature the solids were removed by filtration and the filtrate was concentrated. To the residue dichloromethane (50 ml) was added. After 10 minutes at room temperature the solids were removed by filtration and the filtrate was concentrated to give 8-chloro-3-(1-methylpiperidin-4-yl)imidazo[1,5-a]pyrazine (1.5 g).

Provenance & Evidence