Three-Component Cascade Synthesis of Fully Substituted Trifluoromethyl Pyrroles via a Cu(II)/Rh(III)-Promoted Aza-Michael Addition/Trifluoromethylation Cyclization/Oxidation Reaction
A three-component cascade reaction of 1,3-enynes, anilines, and Togni-II reagent has been developed to give fully substituted trifluoromethyl pyrroles with high regioselectivity under mild conditions. The transformation proceeds through a Cu(II)/Rh(III)-promoted cascade aza-Michael addition/trifluoromethylation cyclization/oxidation reaction, affording trifluoromethyl pyrrole derivatives as primary
We designed and prepared a trifluoromethylation reagent, N-trifluoromethylsuccinimide (NTFS), and use it for the trifluoromethylation of aromatic amines without metal. This protocol exhibits broad substrate scope and wide functional group compatibility. The synthetic utility of the method is further demonstrated by the improvedsynthesis of the antiasthmatic drug Mabuterol.