Transient Directing Group Strategy as a Unified Method for Site Selective Direct C4–H Halogenation of Indoles
作者:Guanghua Kuang、Dandan Liu、Xuerong Chen、Guangyuan Liu、Yang Fu、Yiyuan Peng、Hua Li、Yirong Zhou
DOI:10.1021/acs.orglett.1c03131
日期:2021.11.5
A unified method for direct C4–H halogenation of indoles has been accomplished with the assistance of anthranilic acids as suitable transient directing groups. Exclusive site selectivity (one out of five potential reactive sites) as well as good functional group tolerance was obtained to install three kinds of halogen atoms (Cl, Br and I, respectively) by using inexpensive N-halosuccinimides (NXS)
在邻氨基苯甲酸作为合适的瞬态导向基团的帮助下,实现了吲哚直接 C4-H 卤化的统一方法。通过使用廉价的N-卤代琥珀酰亚胺 (NXS) 作为卤素源,在以下条件下获得了独家的位点选择性(五分之一的潜在反应位点)以及良好的官能团耐受性来安装三种卤素原子(分别为 Cl、Br 和 I)条件温和。利用产物中丰富的官能团,通过一步后期推导,轻松构建了多种含氮杂环。