Iridium‐Catalyzed Annulation Reactions of Thiophenes with Carboxylic Acids: Direct Evidence for a Heck‐type Pathway
作者:Guangying Tan、Qiulin You、Jingbo Lan、Jingsong You
DOI:10.1002/anie.201802539
日期:2018.5.22
The functionalization of thiophenes is a fundamental and important reaction. Herein, we disclose iridium‐catalyzed one‐pot annulation reactions of (benzo)thiophenes with (hetero)aromatic or α,β‐unsaturated carboxylic acids, which afford thiophene‐fused coumarin‐type frameworks. Dearomatization reactions of 2‐substituted thiophenes with α,β‐unsaturated carboxylic acids deliver various thiophene‐containing
Rhodium(III)-Catalyzed<i>ortho</i>CH Heteroarylation of (Hetero)aromatic Carboxylic Acids: A Rapid and Concise Access to π-Conjugated Poly-heterocycles
作者:Xurong Qin、Xiaoyu Li、Quan Huang、Hu Liu、Di Wu、Qiang Guo、Jingbo Lan、Ruilin Wang、Jingsong You
DOI:10.1002/anie.201501982
日期:2015.6.8
functionalized ortho‐carboxy‐substituted bi(hetero)aryls. The use of a carboxy group as the directing group obviates tedious steps for installation and removal of extra directing groups, and enables a facile one‐step synthesis of ortho‐carboxy bi(hetero)aryls. The method provides opportunities for rapid assembly of a library of important fluorene and coumarin‐type poly‐heterocycles through intramolecular
RH III催化的氧化Ç H / C ħ交叉偶联(杂)芳族羧酸和各种杂芳烃之间已经完成构建高度官能化邻-羧基-取代的双(杂)芳基。使用羧基作为导向基团可避免安装和除去额外导向基团的繁琐步骤,并能轻松地一步合成邻位基团-羧基联(杂)芳基 该方法为通过分子内亲电子取代或氧化内酯化快速组装重要的芴和香豆素型多杂环文库提供了机会。作为说明性例子,本文开发的策略极大地简化了对各种有吸引力的多杂环化合物的访问,例如DTPO(5 H- dithieno [3,2- b:2',3' - d ] pyran-5-one),CPDTO(cyclopentadithiophen) -4-1)和茚并噻吩。