Redox Cyclization of Amides and Sulfonamides with Nitrous Oxide for Direct Synthesis of Heterocycles
作者:Zhencheng Lai、Chaorong Wang、Jiaming Li、Sunliang Cui
DOI:10.1021/acs.orglett.0c00397
日期:2020.3.6
Herein we report a redox cyclization of amides and sulfonamides with nitrous oxide (N2O) for the direct synthesis of heterocycles. Various amides and sulfonamides could undergo directed ortho metalation (DoM) by treatment with BuLi, and the lithium intermediate could be trapped by N2O gas to achieve redox cyclization. N2O serves as a N-atom donor to mediate the intramolecular coupling of lithium species
本文中,我们报告了酰胺和磺酰胺与一氧化二氮(N2O)的氧化还原环化反应,用于杂环的直接合成。各种酰胺和磺酰胺可以通过BuLi处理进行定向原位金属化(DoM),并且锂中间体可以被N2O气体捕获以实现氧化还原环化。N 2 O用作N原子供体,以介导锂物质的分子内偶联,与游离的外部氧化剂形成杂环。该协议提供了杂环的直接合成,具有易于获得的起始原料,简单的操作和广泛的底物范围的特征。