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

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
› Institutsangaben
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.


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



Publikationsverlauf

Eingereicht: 12. November 2020

Angenommen nach Revision: 04. Dezember 2020

Artikel online veröffentlicht:
16. Dezember 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/)

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany