Sunlight-Driven Synthesis of 1,2,4-Thiadiazoles via Oxidative Construction of a Nitrogen-Sulfur Bond Catalyzed by a Reusable Covalent Organic Framework

Employing a two-dimensional covalent organic framework as the reusable solar photosensitizer, the sunlight-driven aerobic oxidative construction of a nitrogen-sulfur bond has been achieved. 3,5-Disubstituted 1,2,4-thiadiazoles are smoothly prepared in water by using this procedure. Furthermore, a radical mechanism with a sunlight-promoted single electron transfer (SET) process is proposed for this transformation.