Open Access
CC BY-NC-ND 4.0 · SynOpen 2020; 04(04): 123-131
DOI: 10.1055/s-0040-1706004
paper

Traceless Redox-Annulations of Alicyclic Amines

Authors

  • Dillon R. L. Rickertsen

    a   Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA
  • Longle Ma

    b   Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA
  • Anirudra Paul

    a   Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA
  • Khalil A. Abboud

    c   Center for X-ray Crystallography, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA
  • Daniel Seidel

    a   Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, USA

Financial support from the NIH–NIGMS (Grant R01GM101389) is gratefully acknowledged. We further acknowledge the National Science Foundation (grant # 1828064 to K.A.A.) and the University of Florida for funding the purchase of the X-ray equipment.


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Abstract

Amines such as 1,2,3,4-tetrahydroisoquinoline undergo redox­-neutral annulations with ortho-(nitromethyl)benzaldehyde. Benzoic­ acid acts as a promoter in these reactions, which involve concurrent amine α-C–H bond and N–H bond functionalization. Subsequent removal of the nitro group provides access to tetrahydroprotoberberines not accessible via typical redox-annulations. Also reported are decarboxylative annulations of ortho-(nitromethyl)benzaldehyde with proline and pipecolic acid.

Supporting Information



Publication History

Received: 12 November 2020

Accepted after revision: 04 December 2020

Article published online:
16 December 2020

© 2020. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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