Direct C3-Selective Arylation of N-Unsubstituted Indoles with Aryl Chlorides, Triflates, and Nonaflates Using a Palladium–Dihydroxyterphenylphosphine Catalyst
successfully applied to the direct C3-arylation of N-unsubstituted indoles with arylchlorides, triflates, and nonaflates. This catalyst showed C3-selectivity, whereas catalysts with other structurally related ligands exhibited N1-selectivity. Complex formation between the lithium salts of the ligand and the indole is assumed to accelerate the arylation at the C3 position. Reactions using 3-alkylindoles afforded
A simple method for the direct arylation of indoles
作者:Kyle Eastman、Phil S. Baran
DOI:10.1016/j.tet.2008.09.028
日期:2009.4
The scope and limitations are described for a powerful new method to access indoles bearing a quaternary center at C-3 using easily accessible bisaryl λ3-iodanes and a cheap organic base.
作者:Nazarii Sabat、Weiping Zhou、Vincent Gandon、Xavier Guinchard、Guillaume Vincent
DOI:10.1002/anie.202204400
日期:2022.7.25
Direct dearomative C3-functionalization of indoles provided access to privileged scaffolds by an umpolung strategy. Against all odds, C3-indolium intermediates could be generated from NH-indoles under operationally simple conditions with triflic acid at room temperature to promote intra- and intermolecular C3-regioselective hydroarylation. DFT studies suggest that these cationic or dicationic intermediates
The direct C3-arylation of N-unsubstituted indoles with arylchlorides and triflates has been realized using a palladium–dihydroxyterphenylphosphine (DHTP) catalyst. The site selectivity is different from that obtained with other structurally related ligands. This unique feature of the DHTP ligand is attributed to complex formation between the lithium salts of the ligand and the indole. The method