Hydrogen‐Bonding‐Promoted Cascade Rearrangement Involving the Enlargement of Two Rings: Efficient Access to Polycyclic Quinoline Derivatives
作者:Wen‐Bin Cao、Shijun Li、Meng‐Meng Xu、Haiyan Li、Xiao‐Ping Xu、Yu Lan、Shun‐Jun Ji
DOI:10.1002/anie.202008110
日期:2020.11.23
An efficient cascade reaction of tryptamine‐derived isocyanides with C,N‐cyclic azomethine imines is described. The polycyclic pyrrolo[2,3‐c]quinoline derivatives, which benefited from rearrangement process driven by hydrogen bonding, could be directly assembled in moderate to good yields (40–87 %) under metal‐free and mild conditions. This transformation involved four new heterocyclic rings formations
描述了一种由色胺衍生的异氰酸酯与C,N-环偶氮甲亚胺的有效级联反应。多环吡咯并[2,3-c]喹啉衍生物得益于氢键驱动的重排过程,可以在无金属和温和条件下以中等到良好的产率(40-87%)直接组装。这种转化涉及四个新的杂环形成,并且独特地是吲哚的开环以及C,N-环偶氮甲亚胺亚胺的环扩展。实验研究和DFT研究都为深入了解反应途径提供了指导,并发现氢键可降低过渡态的自由能垒。这项工作是基于色胺的异氰酸酯级联反应的罕见例子,