Synthesis of 2‑Unsubstituted Pyrrolidines and Piperidines from Donor–Acceptor Cyclopropanes and Cyclobutanes: 1,3,5-Triazinanes as Surrogates for Formylimines Lennart K. B. Garve Alexander Kreft Peter G. Jones Daniel B. Werz 10.1021/acs.joc.7b01631.s001 https://acs.figshare.com/articles/journal_contribution/Synthesis_of_2_Unsubstituted_Pyrrolidines_and_Piperidines_from_Donor_Acceptor_Cyclopropanes_and_Cyclobutanes_1_3_5-Triazinanes_as_Surrogates_for_Formylimines/5311387 A synthetic procedure to access 2-unsubstituted pyrrolidines and piperidines is presented. In the presence of MgI<sub>2</sub> as Lewis acid, donor–acceptor cyclopropanes or corresponding cyclobutanes were treated with 1,3,5-triazinanes, leading to the five- or six-membered ring systems under mild conditions in yields up to 93%. This protocol tolerates a great variety of functional groups and thus provides an efficient entry to this class of pyrrolidines and piperidines. 2017-08-07 00:00:00 Piperidine MgI 2 presence Pyrrolidine Cyclobutane Donor piperidine variety cyclobutane Cyclopropane Synthesi Lewis acid Formylimine Surrogate access 2- unsubstituted pyrrolidines Triazinane Unsubstituted cyclopropane donor six-membered ring systems triazinane yield entry procedure