Rh-Catalyzed [4 + 2] Annulation with a Removable Monodentate Structure toward Iminopyranes and Pyranones by C-H Annulation

Org Lett. 2022 Apr 29;24(16):3003-3008. doi: 10.1021/acs.orglett.2c00912. Epub 2022 Apr 20.

Abstract

The Rh-catalyzed reactions of N-pyridinyl enaminones with internal alkynes leading to the synthesis of iminopyranes via a key C-H bond activation and subsequent tautomeric O-H bond cleavage are reported. Moreover, the pyridine ring in the amino group acts as an auxiliary monodentate site for this annulation and can be easily removed by a simple hydrolysis to afford pyranones.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkynes / chemistry
  • Catalysis
  • Rhodium* / chemistry

Substances

  • Alkynes
  • Rhodium