Direct Palladium-Catalyzed C-2 and C-3 Arylation of Indoles: A Mechanistic Rationale for Regioselectivity
作者:Benjamin S. Lane、Meghann A. Brown、Dalibor Sames
DOI:10.1021/ja043273t
日期:2005.6.1
We have recently developed palladium-catalyzed methods for directarylation of indoles (and other azoles) wherein high C-2 selectivity was observed for both free (NH)-indole and (NR)-indole. To provide a rationale for the observed selectivity (“nonelectrophilic” regioselectivity), mechanistic studies were conducted, using the phenylation of 1-methylindole as a model system. The reaction order was determined
A visible-light induced green and efficient method is developed for the synthesis of α-indolyl diethyl malonates. The reaction proceeds without any photocatalysts or ligands in a green solvent in a short time. Moreover, the reaction mechanism has been clearly studied by control experiments, spectrophotometric studies and density functional theory (DFT) calculations. The results showed that the photocatalyst-free
Synthesis of 2‐Substituted Benzothio(seleno)phenes and Indoles
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Ag‐Catalyzed Cyclization/Demethylation of 2‐Alkynylthio(seleno)anisoles and 2‐Alkynyldimethylanilines
Herein, we have successfully developed an efficient protocol for the construction of benzothio(seleno)phenes and indoles through an Ag‐mediated cyclization/demethylation process. Various 2‐substituted benzothio(seleno)phenes and indoles were obtained in good to excellent yields under mild reaction conditions with low catalyst loading. A conceivable reaction mechanism was proposed and supported by an