Enantioselective Formation of All-Carbon Quaternary Stereocenters in gem-Difluorinated Cyclopropanes via Rhodium-Catalyzed Stereoablative Kinetic Resolution

Org Lett. 2022 Aug 26;24(33):6176-6181. doi: 10.1021/acs.orglett.2c02410. Epub 2022 Aug 11.

Abstract

Herein, we report an effective method to offer chiral gem-difluorinated cyclopropanes containing an all-carbon quaternary stereocenter by rhodium-catalyzed stereoablative kinetic resolution. The activation of a sterically hindered all-carbon quaternary C-C bond through oxidative addition with a chiral rhodium complex is proposed as the enantiodetermining step. A wide range of gem-difluorinated cyclopropanes can be obtained with excellent ee values (ee = 87% to >99.9%), which are demonstrated to be useful chiral fluorine-containing building blocks by a series of postfunctionalizations.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carbon / chemistry
  • Catalysis
  • Cyclopropanes / chemistry
  • Molecular Structure
  • Rhodium* / chemistry
  • Stereoisomerism

Substances

  • Cyclopropanes
  • Carbon
  • Rhodium