one-pot gold-catalyzed synthesis of 3-silylethynyl indoles from unprotected o-alkynylanilines
;Jonathan P. Brand;Clara Chevalley;Jérôme Waser
Molecular autism2011Vol. 7pp. 565-569
225
brand2011beilsteinone-pot
Abstract
The Au(III)-catalyzed cyclization of 2-alkynylanilines was combined in a one-pot procedure with the Au(I)-catalyzed C3-selective direct alkynylation of indoles using the benziodoxolone reagent TIPS-EBX to give a mild, easy and straightforward entry to 2-substituted-3-alkynylindoles. The reaction can be applied to unprotected anilines, was tolerant to functional groups and easy to carry out (RT, and requires neither an inert atmosphere nor special solvents).