Synthesis of 1,2,4-Triazolo[4,3-<i>a</i>
]pyridines and Related Heterocycles by Sequential Condensation and Iodine-Mediated Oxidative Cyclization
作者:Ertong Li、Zhiyuan Hu、Lina Song、Wenquan Yu、Junbiao Chang
DOI:10.1002/chem.201601744
日期:2016.7.25
A facile and efficient approach to access 1,2,4‐triazolo[4,3‐a]pyridines and related heterocycles has been accomplished through condensation of readily available aryl hydrazines with corresponding aldehydes followed by iodine‐mediated oxidative cyclization. This transition‐metal‐free synthetic process is broadly applicable to a variety of aromatic, aliphatic, and α,β‐unsaturated aldehydes, and can
通过容易获得的芳基肼与相应的醛缩合,然后由碘介导的氧化环化反应,可以轻松而有效地获得1,2,4-三唑并[4,3- a ]吡啶和相关杂环。这种无过渡金属的合成方法广泛适用于各种芳香族,脂肪族和α,β-不饱和醛类,并且可以以克为单位方便地进行。