Fig. 6: Investigation of the mechanism.
a Control reaction of 1a with 2a without Sc(OTf)3. b Control reaction of 1a with 2a without DQ. c Control reaction of 1a with 2a without Cat-D. d Control reaction of 63 with 2a without Cat-D and Sc(OTf)3. e Control reaction of 63 with 2a without Sc(OTf)3.
