Achieving Site-Selectivity for C-H Activation Processes Based on Distance and Geometry: A Carpenter's Approach

J Am Chem Soc. 2020 Jun 17;142(24):10571-10591. doi: 10.1021/jacs.0c04074. Epub 2020 Jun 5.

Abstract

The ability to differentiate between highly similar C-H bonds in a given molecule remains a fundamental challenge in organic chemistry. In particular, the lack of sufficient steric and electronic differences between C-H bonds located distal to functional groups has prevented the development of site-selective catalysts with broad scope. An emerging approach to circumvent this obstacle is to utilize the distance between a target C-H bond and a coordinating functional group, along with the geometry of the cyclic transition state in directed C-H activation, as core molecular recognition parameters to differentiate between multiple C-H bonds. In this Perspective, we discuss the advent and recent advances of this concept. We cover a wide range of transition-metal-catalyzed, template-directed remote C-H activation reactions of alcohols, carboxylic acids, sulfonates, phosphonates, and amines. Additionally, we review eminent examples which take advantage of non-covalent interactions to achieve regiocontrol. Continued advancement of this distance- and geometry-based differentiation approach for regioselective remote C-H functionalization reactions may lead to the ultimate realization of molecular editing: the freedom to modify organic molecules at any site, in any order.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Review

MeSH terms

  • Alcohols / chemistry*
  • Amines / chemistry*
  • Carboxylic Acids / chemistry*
  • Catalysis
  • Molecular Structure
  • Organophosphonates / chemistry*
  • Sulfinic Acids / chemistry*
  • Transition Elements / chemistry*

Substances

  • Alcohols
  • Amines
  • Carboxylic Acids
  • Organophosphonates
  • Sulfinic Acids
  • Transition Elements