Fig. 2: Mechanistic studies.

a Control experiments. b Racemization profile of (S)-1a and (S)-1d. c Kinetic profile of the reaction of 1d and 2a. d Effect of addition time of quinone 2a′ on the e.e. values of 4a. e Proposed catalytic cycles for the copper-catalyzed enantioselective electrochemical regiodivergent CDC reactions.