Asymmetric Oxidation of Organosulfur Compounds

The asymmetric oxidation of organosulfur compounds encompasses strategies to convert prochiral or racemic sulfides into enantioenriched sulfoxides or sulfones under controlled, stereoselective conditions. This field integrates diverse approaches—transition-metal catalysis, organocatalysis and photocatalysis—each designed to manage the delivery of oxidants such as hydrogen peroxide, molecular oxygen or singlet oxygen. Chiral ligand frameworks or sensitizers induce enantioselectivity by creating a stereochemically biased environment around the sulphur centre. Contemporary efforts focus on mild reaction conditions, high atom economy and catalyst recyclability, reflecting global imperatives for sustainable and scalable syntheses of chiral sulfoxides. These valuable intermediates find widespread applications in pharmaceuticals, agrochemicals and fine-chemical manufacture, where control over absolute configuration can profoundly affect biological activity and downstream synthetic utility.

Research from Nature Portfolio

Recent studies have demonstrated that visible-light sensitizers can drive aerobic oxidation of thioethers into sulfoxides with remarkable selectivity and minimal catalyst loading. A pioneering approach uses a photosensitizer at 0.1 mol% under ambient air to achieve high yields of sulfoxides without overoxidation to sulfones. Mechanistic investigations reveal that both singlet oxygen and superoxide radical anion participate in the oxido-transfer sequence, offering a dual-pathway model that departs from earlier singlet-oxygen-only paradigms. The result is a broadly applicable, green protocol for enantioenriched sulfoxide synthesis under exceptionally mild, sustainable conditions.

Asymmetric Oxidation of Organosulfur Compounds publication trend

The graph below shows the total number of articles in asymmetric oxidation of organosulfur compounds across all publications each year (not limited to Nature Index journals).

Technical terms

Asymmetric oxidation: A reaction that introduces an oxygen atom into a substrate in a manner that creates or enhances chirality, yielding enantioenriched products.

Sulfoxide: An organosulfur compound containing a sulphur atom bonded to two carbon atoms and one oxygen atom (R2S=O), often chiral when the two carbon substituents differ.

Singlet oxygen: An electronically excited form of molecular oxygen with paired electron spins, highly reactive in oxidation processes.

Enantioselectivity: The preferential formation of one enantiomer over the other in a chiral chemical reaction.

Photocatalysis: Acceleration of a chemical reaction by light in the presence of a catalyst that absorbs photons and facilitates redox transformations.

References

1. Recyclable and Stable Porphyrin‐Based Self‐Assemblies by Electrostatic Force for Efficient Photocatalytic Organic Transformation. Advanced Science (2024).
2. Visible light sensitizer-catalyzed highly selective photo oxidation from thioethers into sulfoxides under aerobic condition. Scientific Reports (2018).
3. Advance in the Synthesis of Sulfoxides and Sulfinamides from β-Sulfinyl Esters. Organics (2023).
4. Palladium-Catalyzed Sulfinylation of Aryl- and Alkenylborons with Sulfinate Esters. Organic Letters (2021).