Pd-Catalyzed Dynamic Kinetic Asymmetric Cross-Coupling of Heterobiaryl Bromides with N-Tosylhydrazones

Org Lett. 2022 Jun 3;24(21):3812-3816. doi: 10.1021/acs.orglett.2c01355. Epub 2022 May 23.

Abstract

A dynamic kinetic asymmetric Pd-catalyzed cross-coupling reaction of heterobiaryl bromides with ketone N-tosylhydrazones for the synthesis of heterobiaryl styrenes is described. The combination of Pd(dba)2 as a precatalyst with a TADDOL-derived phosphoramidite ligand provides the corresponding coupling products in good yields and high enantioselectivities under mild conditions. Racemization-free N-oxidation and N-alkylation of the products allowed us to obtain appealing functionalized axially chiral heterobiaryl derivatives.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkylation
  • Bromides*
  • Catalysis
  • Ligands
  • Palladium*

Substances

  • Bromides
  • Ligands
  • Palladium