Nanocatalyzed Hydrogen Isotope Exchange.

Area of Science:

• Chemical Synthesis
• Materials Science
• Biochemistry

Background:

• Hydrogen isotope exchange (HIE) reactions are crucial for mechanistic studies, drug development (deuterium-labeled drugs improving ADME properties), and creating stable isotopically labeled internal standards (SILS) for omics analyses.
• Traditional multi-step synthesis for labeled compounds is time- and resource-intensive.
• Metal-catalyzed HIE reactions, while useful, often suffer from insufficient isotope incorporation or lack of selectivity.

Purpose of the Study:

• To develop powerful synthetic methods for accessing deuterated and tritiated molecules with high isotope incorporation and selectivity.
• To explore nanocatalysis as a tool for late-stage hydrogen isotope incorporation in complex molecules.
• To investigate the mechanisms underlying regioselectivity in metal nanoparticle-catalyzed HIE reactions.

Main Methods:

• Utilizing ruthenium (Ru) or iridium (Ir) metallic nanoclusters for regio- and chemoselective hydrogen isotope exchange reactions.
• Applying nanocatalysis for labeling diverse scaffolds, including heterocyclic and acyclic compounds.
• Employing theoretical calculations to elucidate reaction mechanisms and regioselectivity.

Main Results:

• Demonstrated the effectiveness of nanocatalysis for regio- and chemoselective, and even enantiospecific, labeling of complex molecules like pharmaceuticals, peptides, and oligonucleotides.
• Achieved high functional group tolerance and obtained highly deuterated compounds and high molar activity tritiated drugs.
• Identified novel key intermediates (4- and 5-membered dimetallacycles) responsible for unique regioselectivities, distinct from homogeneous catalysis.

Conclusions:

• Nanocatalysis presents an innovative and advantageous approach for isotopic labeling and C-H bond activation, combining benefits of homogeneous and heterogeneous catalysis.
• Metal nanoparticles offer unique reactivity due to their surface properties and available coordination sites.
• This method provides efficient access to complex labeled molecules crucial for various scientific fields.