Synlett 2024; 35(07): 747-752
DOI: 10.1055/s-0042-1751487
synpacts

Insights into the Regioselectivity of Metal-Catalyzed Aryne Reactions

Erin E. Plasek
,
Brylon N. Denman
,
The University of Minnesota is acknowledged for startup funds. We also acknowledge the National Institutes of Health (NIH) (R35GM146957) for funds. Instrumentation for the UMN Chemistry NMR facility was supported from a grant through the NIH (S10OD011952). E.E.P. was funded by the Newman and Lillian Bortnick fellowship and B.N.D was funded by the Robert and Jill DeMaster fellowship.


Abstract

The synthetic potential of unsymmetrically substituted aryne intermediates is significantly hindered by regioselectivity issues. Current methods for inducing regioselectivity all rely on substrate control and are focused on non-metallated arynes. Before our initial disclosure, there was no systematic study regarding the regioselectivity of metal-catalyzed aryne reactions. By exploiting ligand control, we have induced regioselectivity in a palladium-catalyzed aryne annulation to form phenanthridinones (up to 9:91 r.r.). Through this study we have investigated: ligand effects, influence of steric perturbation, and the impact of the aryne precursor.

1 Introduction

2 Inducing Regioselectivity via Ligand Control

3 A Comparison of o-Borylaryl Triflate Aryne Precursors to Kobayashi Aryne Precursors

4 Conclusion



Publication History

Received: 01 July 2023

Accepted after revision: 31 July 2023

Article published online:
18 September 2023

© 2023. Thieme. All rights reserved

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany