Fig. 5: Control experiments.

a Control reaction with/ without water and ¹⁸O-isotope labeling; b Control reaction of aniline with BrCF₂CO₂K; c Cross-multicomponent reaction with 10a and 11a; d Control reaction without copper; e Competition experiment of BrCF₂COOK, 4-bromoaniline 1a and silyl enol ether 13a.