Herein, we demonstrated that 2-alkynyldimethylamines easily cyclize in EtOH according to a 5-endo-dig annulation into 2-substitutedindoles without the aid of any additives or any metal catalysts to activate the triple bond. Thus, a variety of functionalized 2-styrylindoles, 2-arylindoles, 2-alkynylindoles, and 2-alkylindoles were prepared in high to excellent yields according to an environmentally
Synthesis of 3-((trifluoromethyl)thio)indoles via a reaction of 2-alkynylaniline with trifluoromethanesulfanylamide
作者:Jie Sheng、Shaoyu Li、Jie Wu
DOI:10.1039/c3cc45958f
日期:——
3-((Trifluoromethyl)thio)indoles can be synthesized by a palladium(II)-catalyzed reaction of 2-alkynylaniline with trifluoromethanesulfanylamide in the presence of bismuth(III) chloride. The presence of bismuth(III) chloride is crucial for the success of this transformation, which activates the trifluoromethanesulfanylamide during the reaction.
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.
Switchable Synthesis of 3-Cyanoindoles and 3-Amidylindoles<i>via</i>a Palladium-Catalyzed Reaction of<i>N</i>,<i>N</i>-Dimethyl-2-alkynylaniline with Isocyanide
AbstractA palladium‐catalyzed reaction of N,N‐dimethyl‐2‐alkynylanilines with isocyanides is reported, leading to the formation of 3‐cyanoindoles and 3‐amidylindoles. The isocyanide insertion is the key step during the process, and the presence of water is essential for the formation of 3‐amidylindoles.magnified image