以相应的未取代的吡啶-1-酰胺和二硫代羧酸甲酯为原料,制备了吡啶-1-酰胺、2-甲基吡啶-1-酰胺和 2,6-二甲基吡啶-1-硫代羧酸酰胺(5-7),收率相当高。5-7 的烷基化反应完全发生在硫代羰基硫上,定量生成吡啶鎓盐。核磁共振光谱研究表明,这些吡啶鎓盐存在 E 和 Z 两种形式。5-7 的热分解产生了相应的吡啶、腈和硫,收率很高。
Despite its low nucleophilicity 2,6-di-tert-butylpyridine (D TBP) easily undergoes N-amination. Other hidered pyridines react similarly. Comparison of the NMR carbon chemical shifts of 2,6-disubstituted 1-aminopyridinium perchlorates and those of the respective 1-methylpyridinium salts shows that the changes are parallel. 1-Amino-2,6-di-tert-butylpyridinium perchlorate does not react with p-dimethylaminobenzaldehyde. However, other hindered 1-(4'-dimethylaminobenzylideneamino)pyridinium salts were obtained by a standard procedure.