I<sub>2</sub>O<sub>5</sub>-Mediated Iodocyclization Cascade of <i>N</i>-(1-Arylallyl)pyridine-2-amines with Concomitant C═C Bond Cleavage: A Synthesis of 3-Iodoimidazo[1,2-<i>a</i>]pyridines
作者:Bingwei Zhou、Yuan Yuan、Hongwei Jin、Yunkui Liu
DOI:10.1021/acs.joc.9b00765
日期:2019.5.3
A facile method for the synthesis of 3-iodoimidazo[1,2-a]pyridines has been successfully developed involving an I2O5-mediated iodocyclization cascade of N-(1-arylallyl)pyridin-2-amines with concomitant C═Cbondcleavage. Preliminary mechanistic studies reveal that this protocol might undergo an oxidative cyclization/decarboxylation/iodination sequence in which I2O5 is used as both an oxidant and an
已成功开发了一种简便的合成3-碘咪唑并[1,2- a ]吡啶的方法,该方法涉及I 2 O 5介导的N-(1-芳基烯丙基)吡啶-2-胺与C═C的碘环化级联反应键断裂。初步的机理研究表明,该方案可能会经历氧化环化/脱羧/碘化过程,其中I 2 O 5既用作氧化剂,又用作碘源。本协议具有衬底范围广,操作简单和无金属条件的优点。
A direct synthesis of carbaldehydes through intramoleculardehydrogenativeaminooxygenation has been developed. The process uses a catalytic amount of copper(II) in DMF or DMA under oxygen and does not require additional oxidants (see scheme). Mechanistic studies suggest that the carbonyl oxygen atom of the aldehyde is derived from oxygen through a copper‐mediated oxygen activation process via a peroxy–copper(III)