反应详情

温度

85 °C

A suspension of 2-chloro-3-aminopyridine (3 g, 23 mmole), and ammonium thiocyanate (3.5 g, 46.5 mmole) in 23 mL of ethanol was acidified with conc. HCl to pH ˜1 (˜1.8 mL). The reaction mixture was heated to 85° C. for 3 days. At this point, the solvent was evaporated and residual water was removed aziotropically by the distillation of 2-propanol. The yellow residue was mixed with 12 mL of 7 M ammonium hydroxide and 7 mL of chloroform. The solid was isolated by filtration to yield 1.50 g (43%) of the product as a white powder. MS (m/z, ES+): 152 (M+1, 100%).

1. customAt this point, the solvent was evaporated
2. customresidual water was removed aziotropically by the distillation of 2-propanol
3. additionThe yellow residue was mixed with 12 mL of 7 M ammonium hydroxide and 7 mL of chloroform
4. customThe solid was isolated by filtration