New palladium-catalyzed reactions of unsaturated triflates with alkenes and alkyenes
The palladium-catalyzed reaction of vinyl triflates with P-substituted-a,P- unsaturated carbonyl compounds affords regio- and stereoselectively the corresponding vinylic substitution derivatives. The application of this reaction to the synthesis of quinolines, coumarins, and cardenolides is described. The palladium- catalyzed reaction of unsaturated triflates with functionalized internal and terminal alkynes produces a variety of heterocyclic compounds such as furans, benzo(hIfurans, indoles, butenolides, y-alkylidene-y-butyrolactones, and precocenes.