Synthesis 2018; 50(01): 84-101
DOI: 10.1055/s-0036-1590952
feature
© Georg Thieme Verlag Stuttgart · New York

Approaches to the Synthesis of Highly Substituted Aromatic and Fused Rings: Metal-Catalysed versus Thermal Cyclisation

Philip J. Parsons*
a   Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK   Email: p.parsons@imperial.ac.uk
,
Lewis A. T. Allen
a   Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK   Email: p.parsons@imperial.ac.uk
,
Daniel R. Jones
a   Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK   Email: p.parsons@imperial.ac.uk
,
Alex C. Padgham
a   Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK   Email: p.parsons@imperial.ac.uk
,
James A. Pryke
b   Division of Chemistry, School of Life Sciences, University of Sussex, Falmer, Brighton, BN1 9QJ, UK
,
Joseph McKenna
b   Division of Chemistry, School of Life Sciences, University of Sussex, Falmer, Brighton, BN1 9QJ, UK
,
Daniel O’Reilly
a   Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK   Email: p.parsons@imperial.ac.uk
› Author Affiliations
A Parsons Scholarship was received by J.A.P. and L.A.T.A., with further funding from Drs. Bader (L.A.T.A.) and Anacor (J.A.P.). An Imperial College PhD Scholarship funded work completed by D.R.J. (EPSRC: 1507589). We also gratefully acknowledge the Bader scholarship received by A.C.P.
Further Information

Publication History

Received: 18 September 2017

Accepted after revision: 13 October 2017

Publication Date:
27 November 2017 (online)


Dedicated to Dr. Alfred Bader on the occasion of his 93rd birthday and in memory of Oxana Bennett

Abstract

A domino reaction has been used for the construction of lactonamycin derivatives. This research led to a comparison study between palladium-mediated cascade cyclisations and thermal alkyne [2+2+2] cyclisations. A palladium-mediated cyclisation of alkenyl bromides with alkynes and furans has been shown to furnish highly substituted aromatic rings. Penta- and hexasubstituted aromatic rings have also been prepared by the thermolysis of suitably substituted alkynes under microwave conditions. Tetrasubstituted pyridines can also be prepared using nitriles instead of alkynes. This work will provide a new and interesting array of drug templates; mechanistic details are discussed for both reaction series.

Supporting Information