A new class of indole-bbased allylic donors have been designed and developed for palladium-catalyzed decarboxylative allylations.In addition,the first application of these indole-based allylic donors in palladium-catalyzed decarboxylative[3+2]cycloaddi-tion and allylic amination has been achieved by reacting with isocyanates and sulfonyl amines,respectively.This approach represents the first design of indole-based allylic donors,which is helpful for settling the challenge of designing and developing new class of heterocycle-based allylic donors for Pd-catalyzed decarboxylative allylation reactions.Moreover,the application of this new class of allylic donors in cycloadditions and substitutions will add new contents to the research field of decarboxylative allylation.