Expanding Ligand Space: Preparation, Characterization, and Synthetic Applications of Air-Stable, Odorless Di-tert-alkylphosphine Surrogates

Barber, Thomas; Argent, Stephen P.; Ball, Liam T.

Abstract

The di-tert-alkylphosphino motif is common to many best-in-class ligands for late-transition-metal catalysis. However, the structural diversity of these privileged substructures is currently limited by the need to manipulate highly toxic, highly reactive reagents and intermediates in their synthesis. In response to this longstanding challenge, we report an umpolung strategy for the synthesis of structurally diverse di-tert-alkylphosphine building blocks via SN1 alkylation of in situ generated PH3 gas. We show that the products—which are isolated as air-stable, odorless phosphonium salts—can be used directly in the preparation of key synthetic intermediates and ligand classes. The di-tert-alkylphosphino building blocks that are accessible using our methodology therefore enable facile expansion of extant ligand classes by modification of a previously invariant vector; we demonstrate that these modifications affect the steric and electronic properties of the ligands and can be used to tune their performance in catalysis.

Citation

Barber, T., Argent, S. P., & Ball, L. T. (2020). Expanding Ligand Space: Preparation, Characterization, and Synthetic Applications of Air-Stable, Odorless Di-tert-alkylphosphine Surrogates. ACS Catalysis, 10, 5454-5461. https://doi.org/10.1021/acscatal.0c01414

• Journal Article Type: Article
• Acceptance Date: Apr 13, 2020
• Online Publication Date: Apr 24, 2020
• Publication Date: Apr 24, 2020
• Deposit Date: Apr 28, 2020
• Publicly Available Date: Apr 25, 2021
• Journal: ACS Catalysis
• Electronic ISSN: 2155-5435
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 10
• Pages: 5454-5461
• DOI: https://doi.org/10.1021/acscatal.0c01414
• Public URL: https://nottingham-repository.worktribe.com/output/4341723
• Publisher URL: https://pubs.acs.org/doi/10.1021/acscatal.0c01414
• Additional Information: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Catalysis, copyright © American Chemical Society after peer review and technical editing by t he publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acscatal.0c01414.