Synthesis 2019; 51(15): 2871-2890
DOI: 10.1055/s-0037-1611478
review
© Georg Thieme Verlag Stuttgart · New York

Carbonylated Indoles from PdII-Catalyzed Intermolecular Reactions of Indolyl Cores

Jean Le Bras
,
Jacques Muzart*
Institut de Chimie Moléculaire de Reims, UMR 7312, CNRS - Université de Reims Champagne-Ardenne, B.P. 1039, 51687 Reims Cedex 2, France   Email: jacques.muzart@univ-reims.fr
› Author Affiliations
Further Information

Publication History

Received: 05 February 2019

Accepted after revision: 14 March 2019

Publication Date:
02 May 2019 (online)


Abstract

This review summarizes palladium-catalyzed carbonylation, transmetalation, and cross-coupling reactions that lead to carbonylated indoles from indoles and indolyl compounds. Special attention is drawn to procedures involving the C(sp2)–H substitution of free (NH)-indoles or (N-substituted)-indoles. Proposed mechanisms are described with, in some cases, personal comments.

1 Introduction

2 Carbonylative Reactions

2.1 Indolyl Halides as Starting Substrates

2.2 Indolyl Iodides as Intermediates

2.3 Indolylborates as Intermediates

2.4 C(sp2)–H Reactions

2.4.1 Carboxylation

2.4.2 Carbonylative Alkoxylation

2.4.3 Carbonylative Arylation

2.4.4 Carbonylative Alkenylation

2.4.5 Carbonylative Alkylation

2.4.6 Double Carbonylation

3 Cross-Coupling of Stannyl- or Mercurioindoles

4 Cross-Coupling of Indoles

4.1 Aldehydes

4.2 Alcohols

4.3 α-Diketones

4.4 α-Oxo Esters

4.5 α-Oxocarboxylic Acids

4.6 Nitriles

4.7 Isocyanides

4.8 Isothiocyanates and Isocyanates

4.9 α-Aminocarbonyl Compounds

4.10 Vinyl Ethers or Vinyl Amides

4.11 Toluene and Substituted Toluenes

4.12 Bromodichloromethane

5 Conclusion