Affiliation:
1. Key Laboratory of Molecule Synthesis and Function Discovery (Fujian Province University) College of Chemistry Fuzhou University Fuzhou 350108 People's Republic of China
2. State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen University Xiamen 361005 People's Republic of China
Abstract
AbstractIndoline‐fused polycycles are commonly found as a key structural component in numerous natural products and biologically active compounds. In recent times, the incorporation of sulfonyl fluoride groups has drawn significant attention in research due to their potential to enhance or confer new biological activities to molecules. In this study, we report the development of a modular approach for synthesizing FSO2‐functionalized cyclobutane‐fused indolines by employing an intermolecular [2+2] cycloaddition reaction between indoles and SuFExable ethenesulfonyl fluoride under triplet energy‐transfer catalysis. This method features mild reaction conditions, metal‐free photocatalysts, and excellent tolerance to various functional groups. Moreover, we demonstrate the feasibility of further modifying the FSO2‐functionalized indoline products via SuFEx click reactions, enabling their conjugation with other molecules.