Rhodium(I)-Catalysed Aryl C–H Carboxylation of 2-Arylanilines with CO2

04 February 2019, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

An unprecedented amino-group assisted C–H carboxylation of 2-arylanilines with CO2 under redox-neutral conditions using a Rhodium(I)-catalyst has been developed. This reaction was promoted by a phosphine ligand with t-BuOK as the base and did not require the use of an extra strong organometallic reagent. Notably, this protocol may involve an oxidative addition in the C–H bond cleavage step and is distinct from previous Rh(I) or Rh(II)-catalysed methods for C–H carboxylation with CO2 mechanistically. It enabled an efficient direct conversion of a broad range of 2-(hetero)arylanilines including electron-deficient heteroarenes to various phenanthridinones, which could be further transformed to other synthetically useful compounds readily. Preliminary mechanistic studies were carried out and possible intermediates of the reaction were evaluated, which revealed that the Rh(I)-catalyst is essential for the C–H activation process, providing a promising general type of method for utilization of CO2 for C–C bond formation.

Keywords

C–H Activation
CO2 fixation
Rhodium Catalyzed
carboxylation reaction

Supplementary materials

Title
Description
Actions
Title
SI-C-H-activation CO2 Li
Description
Actions

Comments

Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.