Intramolecular redox cyclization reaction access to cinnolines from 2-nitrobenzyl alcohol and benzylamine <i>via</i> intermediate 2-nitrosobenzaldehyde
A transition-metal-free intramolecular redox cyclization reaction for the synthesis of cinnolines has been developed from 2-nitrobenzyl alcohol and benzylamine. Mechanistic investigations disclosed the involvement of a key intramolecular redox reaction, followed by condensation, azo isomerization to hydrazone, cyclization, and aromatization to form the desired products. Notably, the formation of intermediate
以 2-硝基苯甲醇和苯甲胺为原料,开发了一种无过渡金属的分子内氧化还原环化反应,用于合成肉啉。机理研究揭示了关键的分子内氧化还原反应的参与,随后是缩合、偶氮异构化为腙、环化和芳构化以形成所需产物。值得注意的是,中间体 2-亚硝基苯甲醛和 ( E )-2-(2-亚苄基肼基) 苯甲醛的形成在这种转化中起着重要作用。