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(A) Substrate scope of the electrophilic partner with piperidines. (B) Substrate scope of the nucleophilic partner with piperidines. [a] Performed at 70 °C. [b] Using 2.0 equiv. of electrophilic partner. [c] Performed at 0 °C for 48 h. [d] Using 20 equiv. of electrophilic partner. † d.r. (C2–C3) >20 : 1 unless otherwise stated.
