Homolytic alkylation of 4-pyridinecarbonitrile with radicals generated by silver nitrate catalyzed oxidative decarboxylation of alkanoic acids and subsequent alkaline hydrolysis afforded 2-alkyl-4-pyridinecarboxylic acids 2a-2e. These were converted into the halogeno-hydroxy substituted anilides 3a-3r via acyl chlorides by reaction with the respective aminophenols at 10 °C. Of the compounds tested, 5-chloro-2-hydroxyphenylamide of 2-butyl-4-pyridinecarboxylic acid 3h showed the highest effect upon oxygen evolution rate in spinach chloroplasts system. The structure-photosynthesis-inhibiting activity relationships are briefly discussed.
4-吡啶甲腈的同源烷基化通过银硝酸催化氧化脱羧烷酸生成的自由基,随后碱性水解,得到2-烷基-4-吡啶羧酸2a-2e。这些化合物通过与相应的氨基酚在10°C下反应生成酰氯,进而转化为卤代-羟基取代的苯胺3a-3r。在测试的化合物中,2-丁基-4-吡啶羧酸的5-氯-2-羟基苯胺3h在菠菜叶绿体系统中对氧气释放速率影响最大。简要讨论了结构-光合抑制活性关系。