Dual Gold‐Catalyzed Formal Tetradehydro‐Diels–Alder Reactions for the Synthesis of Carbazoles and Indolines
作者:Hong‐Fa Wang、Shi‐Yue Wang、Tian‐Zhu Qin、Weiwei Zi
DOI:10.1002/chem.201804529
日期:2018.12.5
dual gold‐catalyzed tetradehydro‐Diels–Alder reaction for the synthesis of nitrogen‐containing aromatic heterocycles. Under the catalytic system (IPrAuNTf2/DIPEA), indolines and carbazoles as well as other N‐containing aromatic heterocycles were prepared in high yields with good functional group tolerance. Unlike the traditional thermal tetradehydro‐Diels–Alder reactions, diluted reaction concentration
这项工作报告了双重金催化的四氢-狄尔斯-阿尔德反应,用于合成含氮芳族杂环。在催化体系(IPrAuNTf 2 / DIPEA)下,以高收率和良好的官能团耐受性制备了二氢吲哚和咔唑以及其他含N的芳族杂环。与传统的热四氢-狄尔斯-阿尔德反应不同,该方案不需要稀释的反应浓度和自由基抑制剂。实验数据支持了涉及亚乙烯基金物质的机制,该机制经历了6π电环化,然后发生1,2-氢转移。