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Base-Mediated Generation of Ketenimines from Ynamides: [3+2] Annulation with Azaallyl Anions.

preprint
submitted on 16.10.2020, 20:50 and posted on 19.10.2020, 10:31 by Agathe C. A. D’Hollander, Eugénie Romero, Kamsana Vijayakumar, Camille le Houérou, Pascal Retailleau, Robert H. Dodd, Bogdan I. Iorga, Kevin Cariou
Under basic conditions and heat, ynamides can serve as precursor to ketenimines, whose synthetic potential is often hampered by their difficulty of acces. Herein, we report that they can undergo a [3+2] cycloaddition with 2-azaallyl anions, obtained from benzylimines under the same reaction conditions. This reaction between two highly reactive intermediates, both generated in situ from bench stable starting materials, gives access to various nitrogen-rich heterocycles. The reaction usually proceeds with excellent diastereoselectivity, in favor of the cis adduct. Deuteration experiments and DFT calculation helped rationalize the regio and stereo-selectivity of the process as well as the formation of side-products.

Funding

LERMIT, grant ANR-10-LABX-33 under the program Inves-tissements d’Avenir ANR-11-IDEX-0003-01

SATT Paris-Saclay (project CARBAMAT)

History

Email Address of Submitting Author

kevin.cariou@cnrs.fr

Institution

Chimie ParisTech, PSL University, CNRS, Institute of Chemistry for Life and Health Sciences

Country

France

ORCID For Submitting Author

0000-0002-5854-9632

Declaration of Conflict of Interest

no conflict of interest

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