SynOpen (Oct 2020)

Traceless Redox-Annulations of Alicyclic Amines

  • Dillon R. L. Rickertsen,
  • Longle Ma,
  • Anirudra Paul,
  • Khalil A. Abboud,
  • Daniel Seidel

DOI
https://doi.org/10.1055/s-0040-1706004
Journal volume & issue
Vol. 04, no. 04
pp. 123 – 131

Abstract

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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.

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