Phosphorus-mediated sp2–sp3 couplings for C–H fluoroalkylation of azines

Xuan Zhang, Kyle G. Nottingham, Chirag Patel, Juan V. Alegre-Requena, Jeffrey N. Levy, Robert S. Paton () and Andrew McNally ()
Additional contact information
Xuan Zhang: Colorado State University
Kyle G. Nottingham: Colorado State University
Chirag Patel: Colorado State University
Juan V. Alegre-Requena: Colorado State University
Jeffrey N. Levy: Colorado State University
Robert S. Paton: Colorado State University
Andrew McNally: Colorado State University

Nature, 2021, vol. 594, issue 7862, 217-222

Abstract: Abstract Fluoroalkyl groups profoundly affect the physical properties of pharmaceuticals and influence almost all metrics associated with their pharmacokinetic and pharmacodynamic profile1–4. Drug candidates increasingly contain trifluoromethyl (CF3) and difluoromethyl (CF2H) groups, and the same trend in agrochemical development shows that the effect of fluoroalkylation translates across human, insect and plant life5,6. New fluoroalkylation reactions have undoubtedly stimulated this shift; however, methods that directly convert C–H bonds into C–CF2X groups (where X is F or H) in complex drug-like molecules are rare7–13. Pyridines are the most common aromatic heterocycles in pharmaceuticals14, but only one approach—via fluoroalkyl radicals—is viable for achieving pyridyl C–H fluoroalkylation in the elaborate structures encountered during drug development15–17. Here we develop a set of bench-stable fluoroalkylphosphines that directly convert the C–H bonds in pyridine building blocks, drug-like fragments and pharmaceuticals into fluoroalkyl derivatives. No preinstalled functional groups or directing groups are required. The reaction tolerates a variety of sterically and electronically distinct pyridines, and is exclusively selective for the 4-position in most cases. The reaction proceeds through initial formation of phosphonium salts followed by sp2–sp3 coupling of phosphorus ligands—an underdeveloped manifold for forming C–C bonds.

Date: 2021
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41586-021-03567-3 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:594:y:2021:i:7862:d:10.1038_s41586-021-03567-3

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/s41586-021-03567-3

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().