反应详情

To 3.8 ml of N,N-dimethylformamide was added dropwise 4.2 ml of phosphorus oxychloride at room temperature, and the mixture was stirred at room temperature for 30 minutes. Thereto 1.6 g of 3-chloro-2-(1H-pyrrol-1-yl)pyridine was added, and the resulting mixture was stirred at 60° C. for 2 hours. The reaction mixture was allowed to cool to room temperature, and then slowly added to ice-water. The mixture was adjusted to pH 4 by an addition of a 2N aqueous sodium hydroxide solution. A deposited precipitate was collected by filtration to obtain 1.7 g of 3-chloro-2-(2-formyl-1H-pyrrol-1-yl)pyridine of the formula:

1. stirringthe resulting mixture was stirred at 60° C. for 2 hours
2. temperatureto cool to room temperature
3. filtrationA deposited precipitate was collected by filtration