Iridium-catalysed C(sp3)−H activation and hydrogen isotope exchange via nitrogen-based carbonyl directing groups
Knight, Nathan and Thompson, James and Parkinson, John Andrew and Lindsay, David and Tuttle, Tell and Kerr, William (2024) Iridium-catalysed C(sp3)−H activation and hydrogen isotope exchange via nitrogen-based carbonyl directing groups. Advanced Synthesis and Catalysis. ISSN 1615-4150 (https://doi.org/10.1002/adsc.202400156)
Text.
Filename: Knight-etal-ASC-2024-Iridium-catalysed-Csp3-H-activation-and-hydrogen-isotope-exchange.pdf
Accepted Author Manuscript Restricted to Repository staff only until 17 April 2025. License: Strathprints license 1.0 Download (1MB) | Request a copy |
Abstract
Growing interest in improved structural diversity within the pharmaceutical industry has led to a focus on more sp3-rich drug frameworks. Meanwhile, spiralling pharmaceutical research and development costs continue to require expedited adsorption, distribution, metabolism, excretion, and toxicity studies, which are heavily reliant on the use of molecules incorporating deuterium and tritium. Herein, we report a an iridium catalyzed C(sp3)−H activation and hydrogen isotope exchange (HIE) methodology capable of utilizing pharmaceutically ubiquitous nitrogen-based carbonyl directing groups. High levels of deuterium incorporation (>80% in 37 of the examples) are demonstrated across a range of substrates (5-, 6- and 7-membered lactams, cyclic carbamates and ureas, acyclic amides), with toleranceof a range of common functional groups (aryl, alkoxy, halogen, ester, alcohol, sulfonamide) and predictable regioselectivity. The applicability of this methodology was demonstrated with up to 98% deuterium incorporation observed in a range of challenging bioactive molecules such as Nefiracetam, Praziquantel, and Unifiram. Density functional theory has provided mechanistic insight into the C-H activation and HIE at both the expected site of incorporation and an unexpected aryl labelling via a 7-membered metallocyclic intermediate.
-
-
Item type: Article ID code: 88929 Dates: DateEvent17 April 2024Published17 April 2024Published Online17 April 2024AcceptedSubjects: Medicine > Pharmacy and materia medica > Pharmaceutical chemistry Department: Faculty of Science > Pure and Applied Chemistry
Technology and Innovation Centre > BionanotechnologyDepositing user: Pure Administrator Date deposited: 23 Apr 2024 14:10 Last modified: 03 May 2024 13:02 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/88929