Synthesis of Indenopyrazole Frameworks via Cascade C-H Functionalization/[3 + 2] Dipolar Cycloaddition/Aromatization Rearrangement Reactions

Org Lett. 2020 Sep 18;22(18):7152-7157. doi: 10.1021/acs.orglett.0c02506. Epub 2020 Aug 28.

Abstract

The redox-neutral Ir(III)- or Ru(II)-catalyzed C-H couplings of azomethine imines with α,α-difluoromethylene alkynes have been realized, leading to the efficient synthesis of indenopyrazole frameworks via a tandem C-H functionalization/[3 + 2] dipolar cycloaddition/ring-opening aromatization rearrangement process, in which the generated fluoroallene species was involved as the dipolarophile via a selective β-F elimination process. Subsequent biological evaluation revealed that these synthesized indenopyrazoles could serve as interesting cytotoxic agents for further development.

Publication types

  • Research Support, Non-U.S. Gov't