NCS-Mediated Direct Synthesis of β‑Chlorosulfoxides from Unactivated Alkenes and Thiophenols

We report a streamlined one-pot methodology for the efficient synthesis of β-chlorosulfoxides from unactivated alkenes and aryl thiophenols using environmentally benign ethyl acetate as the reaction medium. The protocol utilizes N-chlorosuccinimide (NCS) in a dual capacity as both chlorine donor and intrinsic oxidant, thereby eliminating hazardous hydrochloric acid and external oxidizing agents. The scalability and reduced environmental impact position this strategy as a practical alternative to traditional multistep approaches.