A new efficient strategy for the synthesis of 3‐trifluoromethyl‐indoles was developed through tandemcyclization/trifluoromethylation of 2‐alkynylanilines and Umemoto's reagent under effect of CuBr. The reaction features the use of cheap copper salt, mild reaction conditions and high yield of products. The preliminary mechanism study indicates the solvent dimethylacetamide acts as the role of dealkylation
synthesis of N-methyl-3-chalcogeno-indoles has been developed via iodine-mediatedelectrophilicannulation reactions of 2-alkynylaniline derivatives with disulfides or diselenides. In the presence of iodine and iron, a variety of 2-alkynylanilines selectively underwent the electrophilicannulation with numerous disulfides or diselenides leading to the corresponding 3-sulfenylindoles and 3-selenenylindoles
Palladium-Catalyzed Synthesis of 2,3-Diaryl-<i>N</i>-methylindoles from <i>ortho</i>-Alkynylanilines and Aryl Pinacol Boronic Esters
作者:Yue-Gui Luo、R. Sidick Basha、Daggula Mallikarjuna Reddy、Yong-Jing Xue、Te-Hsuan Chen、Chin-Fa Lee
DOI:10.1021/acs.orglett.8b02835
日期:2018.11.2
A palladium-catalyzed synthesis of 2,3-diaryl-N-methylindoles from o-alkynylanilines and aryl pinacol boronic esters was developed. The system possesses high functional group tolerance and a broad substrate scope with a variety of aryl pinacol boronic esters to provide valuable 2,3-diaryl-N-methylindoles in moderate to good yields. Remarkably, the sequential reaction controlled by iridium-catalyzed
Palladium-catalyzed synthesis of 2,3-disubstituted indoles <i>via</i> arylation of <i>ortho</i>-alkynylanilines with arylsiloxanes
作者:Yang-Ting Hsia、Yu-Lin Lu、Rekha Bai、Satpal Singh Badsara、Chin-Fa Lee
DOI:10.1039/d3ob00961k
日期:——
study, we report the electrophiliccyclization of N,N-dimethyl-o-alkynylanilines with arylsiloxanes in the presence of [Pd(OAc)2] and Ag2O catalytic system, which leads to the efficient synthesis of indoles, similar to the one that is obtained through Larock indole synthesis. A range of aryl(trimethoxy)silanes with EDGs and EWGs were successfully utilized for the synthesis of a diverse variety of substituted
In this manuscript we described the FeCl3/diorganyl diselenides promoted intramolecular cyclization of o-alkynyl anilines, as an alternative for the construction of functionalized 3-organoselenyl indoles. The cyclization reactions proceeded smoothly at room temperature in the presence of air giving the 3-organoselenyl indoles in good yields. Additionally, the 3-organoselenyl indoles proved to be quite useful as synthetic intermediates for the construction of more functionalized indole units through a selenium-lithium exchange reaction followed by trapping the lithium intermediate with different electrophiles.