A method of making a 2-halonicotinonitrile comprises reacting an alkylidene nitrile with a C1-compound in an organic solvent and a dehydrating agent. The dehydrating agent substantially retards dimerization of the alkylidene nitrile during the reaction. The enamine intermediate that forms from the reaction is cyclized using a halide donor to make the 2-halonicotinonitrile.
制备2-卤代烟酰腈的方法包括在有机溶剂和脱
水剂中,将烯基腈与一种C1化合物反应。脱
水剂在反应过程中显著延缓烯基腈的二聚化。由反应形成的恩胺中间体通过使用卤化物给体进行环化,制备2-卤代烟酰腈。