Regiocontrolled Microwave Assisted Bifunctionalization of 7,8-Dihalogenated Imidazo[1,2-a]pyridines: A One Pot Double-Coupling Approach
作者:Emilie Marie、Sébastien Bouclé、Cécile Enguehard-Gueiffier、Alain Gueiffier
DOI:10.3390/molecules170910683
日期:——
towards Suzuki-Miyaura, Sonogashira, and Buchwald-Hartwig cross-coupling reactions as well as cyanation was evaluated. Various methodologies are proposed to introduce aryl, heteroaryl, alkyne, amine or cyano groups in the two positions depending on the nature of the substituent present in position 2. In both series, the substitution of the iodine atom was totally regioselective and the difficulty was
7-氯-8-碘-和 8-氯-7-碘咪唑并[1,2-a] 吡啶 1a-e 在 2 位不同取代的反应性,对 Suzuki-Miyaura、Sonogashira 和 Buchwald-Hartwig 交叉-偶联反应以及氰化被评估。提出了各种方法来在两个位置引入芳基、杂芳基、炔、胺或氰基,这取决于位置 2 中存在的取代基的性质。在这两个系列中,碘原子的取代完全是区域选择性的,困难在于在第二步中取代氯原子。到目前为止,通过 Suzuki-Miyaura 交叉偶联只能引入杂(芳基)基团。我们克服了并行评估两种区域异构体的问题。还研究了双耦合方法,允许一锅 Suzuki/Suzuki,