Intermolecular 1,2,4-Thiadiazole Synthesis Enabled by Enzymatic Halide Recycling with Vanadium-Dependent...

Area of Science:

• Biotechnology
• Organic Chemistry
• Enzymology

Background:

• Enzymatic synthesis offers a sustainable route to valuable molecules.
• Heterocycle construction is crucial for pharmaceuticals and materials.
• Developing efficient biocatalytic methods for C-S bond formation is an ongoing challenge.

Purpose of the Study:

• To develop an enzyme-mediated strategy for the oxidative dimerization of thioamides.
• To utilize enzymatic halide recycling for sustainable heterocycle synthesis.
• To apply this biocatalytic method for synthesizing anticancer agents.

Main Methods:

• Enzyme-catalyzed oxidative dimerization of thioamides using vanadium-dependent haloperoxidase.
• Enzymatic halide recycling with hydrogen peroxide as the oxidant.
• Mechanistic studies including molecular docking to elucidate reaction pathways.
• Preparative scale chemoenzymatic synthesis of penicilliumthiamine B.

Main Results:

• Successful oxidative dimerization of diverse thioamides to 1,2,4-thiadiazoles in moderate to high yields.
• Demonstrated excellent chemoselectivity in the biocatalytic transformation.
• Elucidated a mechanism involving two enzyme-mediated sulfur halogenation steps.
• Achieved preparative scale synthesis of the anticancer agent penicilliumthiamine B.

Conclusions:

• Enzymatic halide recycling provides a powerful platform for intermolecular bond formation.
• This biocatalytic approach enables sustainable and efficient synthesis of important heterocycles.
• The developed method holds promise for pharmaceutical synthesis and drug discovery.