通过使用锂化的杂环,芳基或杂芳基硼酸酯和亲电卤素源,通过无过渡金属的sp2-sp2交叉偶联策略,可以实现多种杂芳基芳基化合物的合成。杂二芳基的构建是通过亲电活化芳基-杂芳基硼酸酯络合物进行的,这引发了1,2-从硼向碳原子的迁移。中间体硼酸酯的随后氧化以良好的产率提供了杂联二芳基。已经进行了全面的11 B NMR研究以支持该机理。在没有过渡金属的情况下,两个亲核交叉偶联伙伴之间的交叉偶联显示了可靠的歧管,可以以高收率获得杂二芳基。呋喃,噻吩,苯并呋喃,苯并噻吩和吲哚等各种杂环具有良好的耐受性。最后,
NaNO
<sub>2</sub>
/K
<sub>2</sub>
S
<sub>2</sub>
O
<sub>8</sub>
‐mediated Selective Radical Nitration/Nitrosation of Indoles: Efficient Approach to 3‐Nitro‐ and 3‐Nitrosoindoles
作者:Adedamola Shoberu、Cheng‐Kun Li、Ze‐Kun Tao、Guo‐Yu Zhang、Jian‐Ping Zou
DOI:10.1002/adsc.201900070
日期:2019.5.14
JPZ acknowledges financial support from the National Natural Science Foundation of China (No. 21172163, 21472133), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and Key Laboratory of Organic Synthesis of Jiangsu Province (KJS1749).
A highly efficient and recyclable Fe<sub>3</sub>O<sub>4</sub> magnetic nanoparticle immobilized palladium catalyst for the direct C-2 arylation of indoles with arylboronic acids
作者:Lei Zhang、Pinhua Li、Can Liu、Jin Yang、Min Wang、Lei Wang
DOI:10.1039/c4cy00040d
日期:——
A highly efficient Fe3O4 magnetic nanoparticle (MNP) immobilized palladiumcatalyst was prepared and applied to the direct C-2 arylation of indoles with arylboronic acids. The reactions generated the corresponding cross-coupling products in good yields. In addition, the supported catalyst with low loading (2.0 mol%) showed high stability and could be recovered and reused 8 times without significant
制备了高效的Fe 3 O 4磁性纳米粒子(MNP)固定的钯催化剂,并将其用于吲哚与芳基硼酸的直接C-2芳基化。反应以良好的产率产生了相应的交叉偶联产物。另外,低负载量(2.0mol%)的负载型催化剂显示出高稳定性,并且可以被回收和再利用8次而没有明显的活性损失。
Mild and selective base-free C–H arylation of heteroarenes: experiment and computation
作者:Hannes P. L. Gemoets、Indrek Kalvet、Alexander V. Nyuchev、Nico Erdmann、Volker Hessel、Franziska Schoenebeck、Timothy Noël
DOI:10.1039/c6sc02595a
日期:——
A mild and selective C–Harylation strategy for indoles, benzofurans and benzothiophenes is described. The arylation method engages aryldiazonium salts as arylating reagents in equimolar amounts. The protocol is operationally simple, base free, moisture tolerant and air tolerant. It utilizes low palladium loadings (0.5 to 2.0 mol% Pd), short reaction times, green solvents (EtOAc/2-MeTHF or MeOH) and
Double C-H Functionalization to Construct Polycyclic Heteroarenes Catalyzed by an Ionic Salt of a Pd Complex with an N-Heterocyclic Carbene Ligand
作者:Sanjay Kumar Ghosh、Bing-Chiuan Kuo、Hsiang-Yu Chen、Jia-Ying Li、Shuang-De Liu、Hon Man Lee
DOI:10.1002/ejoc.201500417
日期:2015.7
A new ionicsalt, cis-[Pd(L)(PPh3)(H2O)2](SO3CF3)2 (A), in which L is an amido-functionalized N-heterocycliccarbene (NHC) ligand, has been prepared by the salt metathesis reaction between [Pd(L)(PPh3)Cl2] and AgOTf in wet acetonitrile. It was successfully characterized by NMR spectroscopy, elemental analysis, and single-crystal X-ray diffraction analysis. Complex A was found to be effective in catalyzing
一种新的离子盐,顺式-[Pd(L)(PPh3)(H2O)2](SO3CF3)2 (A),其中 L 是酰胺基官能化的 N-杂环卡宾 (NHC) 配体,由[Pd(L)(PPh3)Cl2] 和 AgOTf 在湿乙腈中的盐复分解反应。通过核磁共振谱、元素分析和单晶X射线衍射分析成功地对其进行了表征。发现配合物 A 在 Cu(OAc)2 和四正丁基溴化铵的存在下,可有效催化各种含氮和硫杂芳烃的双 C-H 官能化,以与炔烃形成稠合的多环杂芳烃化合物。吲哚、噻吩、咪唑并[1,2-a] 吡啶和咪唑用作底物。特别是,在所采用的条件下,可以获得有趣的咪唑并[5,1,2-cd]吲哚嗪化合物。
Palladium-Catalyzed Direct C-2 Arylation of Indoles with Potassium Aryltrifluoroborate Salts
作者:Jinlong Zhao、Yuhong Zhang、Kai Cheng
DOI:10.1021/jo801371w
日期:2008.9.19
been developed to achieve Pd(OAc)2-catalyzed regioselective cross-coupling between indoles and potassium aryltrifluoroarylborates in the presence of Cu(OAc)2 in acetic acid at room temperature. A variety of potassium aryltrifluoroborates selectively undergo the direct arylation across indoles and afford 2-aryl indoles in moderate to good yields.