Palladium-Catalyzed Regioselective Oxidative Coupling of Indoles and One-Pot Synthesis of Acetoxylated Biindolyls
作者:Zunjun Liang、Jinlong Zhao、Yuhong Zhang
DOI:10.1021/jo902265s
日期:2010.1.1
developed to achieve Pd-catalyzed homocoupling of indoles with excellent regioselectivity in the presence of Cu(OAc)2·H2O in DMSO at room temperature in high efficiency. This method provides a simple route to 2,3′-biindolyls from the electron-rich to moderately electron-poor indoles. The reaction tolerates the bromide substituent on indoles. In addition, a one-pot approach to C3-position acetoxylated biindolyls
Palladium-Catalyzed Oxidative CH/CH Cross-Coupling of Indoles and Pyrroles with Heteroarenes
作者:Zhen Wang、Kaizhi Li、Dongbing Zhao、Jingbo Lan、Jingsong You
DOI:10.1002/anie.201101416
日期:2011.5.27
Doubling up: The highly regioselective C3 heteroarylation of either an indole or a pyrrole with an array of electron‐rich and electron‐poor N‐heteroarenes has been carried out using a palladium/copper co‐catalytic system. The double CH activation selectively delivers the unsymmetrical bi‐heteroaryl product instead of the homocoupled products.
A mild, metal-free, and environmently benign iodine-promoted regioselective C-C and C-N bonds formation of N-protected indole derivatives giving 2,3'-biindoles 2 and 4-(1H-indol-2-yl)morpholines 4 is successfully demonstrated. Various bioactive 2,3'-biindoles and 4-(1H-indol-2-yl)morpholines, bearing electron-rich to moderately electron-poor substituents, can be prepared in moderate to good yields.
Ligand-Controlled Selectivity in the Pd-Catalyzed C–H/C–H Cross-Coupling of Indoles with Molecular Oxygen
作者:Igor Beckers、Besir Krasniqi、Prashant Kumar、Daniel Escudero、Dirk De Vos
DOI:10.1021/acscatal.0c04893
日期:2021.2.19
the selective C–H/C–H cross-coupling of N-substituted indoles without directing groups, driven by molecular oxygen under mild conditions. The selectivity of the C–H activations was studied via kinetic experiments and computational investigations. A quantitative Hammett study of the aromatic carboxylate ligands shows that regioselectivity can be directed by rationally tuning their electronic properties