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。
Direct synthesis of spirobifluorenes by formal dehydrative coupling of biaryls and fluorenones
A Tf2O-mediated, direct dehydrative coupling of (hetero)biaryls and fluorenones proceeds to form the corresponding spirobifluorenes in good to high yields. The reaction system allows the relatively simple nonhalogenated and nonmetalated starting substrates to be directly adopted in the spirocyclisation reaction. In addition, the double cyclisation reaction is easily performed, giving the highly spiro-conjugated
Synthesis of Benzo[a]carbazoles and Dibenzo[c,g]carbazoles via Sequential Gold Catalysis and Photomediated Cyclization
作者:Lijun Zhang、Zhuo Wang、Zhiguang Song
DOI:10.1021/acs.joc.4c00746
日期:2024.6.21
benzo[a]carbazole and dibenzo[c,g]carbazole frameworks. The detailed gold catalytic reaction conditions developed for the challenging intermolecular carbon nucleophilic addition to internal alkynes are realized, giving the desired alkyne hydroarylation products in good yields. The resulting trisubstituted alkenes are able to undergo photomediated cyclization, furnishing the desired carbazole molecules
在此,我们报告了构建苯并[ a ]咔唑和二苯并[ c , g ]咔唑框架的反应方案。实现了为内部炔烃进行具有挑战性的分子间碳亲核加成而开发的详细金催化反应条件,以良好的收率得到了所需的炔烃加氢芳基化产物。所得三取代烯烃能够进行光介导环化,以优异的产率和高效率提供所需的咔唑分子。
Exploration of Biaryl Carboxylic Acids as Proton Shuttles for the Selective Functionalization of Indole C–H Bonds
A survey of diversely substituted 2-arylbenzoic acids were synthesized and tested for use as proton shuttle in the direct arylation of indoles with bromobenzenes. It was found that 3-ethoxy-2-phenylbenzoic acid gives superior yield and selectivity for this class of substrates.