Pd(II)-Catalyzed Intramolecular C(sp<sup>2</sup>)–H Arylation of Tryptamines Using the Nonsteric NH<sub>2</sub> as a Directing Group
作者:Sixi Wang、Bin Yu、Hong-Min Liu
DOI:10.1021/acs.orglett.0c03668
日期:2021.1.1
The free amine-directed C–H functionalization reactions are challenging and mainly restricted to bulky amines. In this work, we report the nonsteric NH2-directed Pd(II)-catalyzed intramolecular C(sp2)–H arylation of tryptamines, which enables the efficient, gram-scale, and regioselective synthesis of versatile 2-aryltryptamines (35 examples, up to 98% yield). This approach broadens the substrate scope
游离胺指导的CH官能化反应具有挑战性,主要限于笨重的胺。在这项工作中,我们报告了非立体NH 2定向的Pd(II)催化的类固醇胺的分子内C(sp 2)–H芳基化反应,从而可以高效,克级和区域选择性地合成通用的2-芳基色胺(35个例子,最高可达98%)。这种方法拓宽了游离胺导向的C–H官能化的底物范围,而不仅限于笨重的胺底物。2-芳基色胺的后期精加工实现了复杂核心结构的多样化构建,这种结构在极有价值的天然产物(如金盏花石,鸟嘌呤和草碱)中普遍存在。