4.8 Article

Enantioselective Reductive N-Cyclization-Alkylation Reaction of Alkene-Tethered Oxime Esters and Alkyl Iodides by Nickel Catalysis

Journal

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 144, Issue 30, Pages 13461-13467

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/jacs.2c05523

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Funding

  1. National Natural Science Foundation of China [22071084]

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This study presents a new method for the preparation of enantioenriched heterocycles through N-cyclization-alkylation reaction, addressing a long-standing challenge in the synthetic community and achieving highly enantioenriched pyrrolines under mild conditions.
Asymmetric cross-electrophile difunctionalization of tethered alkenes has become a powerful tool for the production of chiral cyclic scaffolds; however, the current studies all focus on carbocyclization reactions. Herein, we report an N-cyclization- alkylation reaction and thus showcase the potential of heterocyclization for accessing new enantioenriched cyclic architectures. This work establishes a new approach for enantioselective aza-Heck cyclization/cross-coupling sequence, which remains a long-standing unsolved challenge for the synthetic community. The reaction proceeds with primary, secondary, and a few tertiary alkyl iodides, and the use of newly defined ligands gave highly enantioenriched pyrrolines with improved molecular diversity under mild conditions. The presence of imine functionality allows for further structural variations.

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