Analytical-scale synthesis of aryl-SF 4 Cl via flow microfluidic technology

The SF 5 group has great potential in influencing the drug-like features of organic molecules due to its chemical stability, hydrophobic surface, electron-withdrawing capability and unique octahedral geometry. However, the difficulty in synthesising SF 5 -containing compounds, particularly in aromatic systems, has impeded the widespread incorporation of this group into desired scaffolds in medicinal chemistry. The most troublesome step operationally involves the synthesis of the intermediate species ArSF 4 Cl from aryl-disulfides. Here, we report an analytical-scale synthesis of ArSF 4 Cl using flow microfluidic technology, allowing for safer handling of reagents and avoiding the need for gloveboxes or Cl 2 cylinders. The system is fairly straightforward to prepare, clean to assemble and can be adapted easily to further developments. As well as making progress towards continuous de novo syntheses of ArSF 5 compounds, this result broadly highlights the potential of flow chemistry in providing new avenues to perform challenging batch reactions. Graphical abstrac