We　reported　herein　a　copper-catalyzed　trifluoromethylarylated　cycloaddition　of　imidazoles　and　olefins　using　CF3SO2Cl　as　the　radical　source　to　synthesize　highly　functionalized　tricyclic　imidazoles.　This　procedure　exhibits　a　wide　range　of　substrate　scope　with　25%-93%　isolated　yields　(36　examples).　Mechanistic　studies　were　carried　out　to　support　a　free　trifluoromethyl　radical　pathway.