Palladium Catalyzed Stereoselective Arylation of Biocatalytically Derived Cyclic 1,3-Dienes: Chirality Transfer via a Heck-Type Mechanism

Org Lett. 2020 Mar 20;22(6):2464-2469. doi: 10.1021/acs.orglett.0c00708. Epub 2020 Mar 9.

Abstract

Microbial arene oxidation of benzoic acid with Ralstonia eutropha B9 provides a chiral highly functionalized cyclohexadiene, suitable for further structural diversification. Subjecting this scaffold to a Pd-catalyzed Heck reaction effects a regio- and stereoselective arylation of the cyclohexadiene ring, with 1,3-chirality transfer of stereogenic information installed in the microbial arene oxidation. Quantum chemical calculations explain the selectivity both by a kinetic preference for the observed arylation position and by reversible carbopalladation in competing positions. Further product transformation allowed the formation of a tricyclic ketone possessing four stereogenic centers. This demonstrates the capability of the method to introduce stereochemical complexity from planar nonchiral benzoic acid in just a few steps.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Benzoates / chemistry
  • Catalysis
  • Cupriavidus necator / chemistry
  • Cupriavidus necator / metabolism*
  • Cyclohexenes / chemical synthesis*
  • Iodobenzenes / chemistry
  • Oxidation-Reduction
  • Palladium / chemistry*
  • Stereoisomerism

Substances

  • Benzoates
  • Cyclohexenes
  • Iodobenzenes
  • Palladium
  • iodobenzene