2023-08-312023-08-312018Wang, A.-F., Hao, W.-J., Zhu, Y.-L., Li, G., Zhou, P., Tu, S.-J., & Jiang, B.. 2018. Double SO2 Insertion into 1,7-Diynes Leading to Functionalized Naphtho[1,2-c]thiophene 2,2-dioxides. ACS Omega, 3(2). https://doi.org/10.1021/acsomega.7b01789https://doi.org/10.1021/acsomega.7b01789https://hdl.handle.net/2346/95856© 2018 American Chemical Society. cc-by-nc-ndA novel metal-free double SO2 insertion/multicomponent bicyclization cascade of benzene-linked 1,7-diynes has been established by treatment with aryldiazonium tetrafluoroborates and DABCO-bis(sulfur dioxide) under redox-neutral conditions, providing a range of dual sulfone-containing naphtho[1,2-c]thiophene 2,2-dioxides with generally high stereoselectivity. The reaction pathway is proposed to proceed through the sequence of arylsulfonyl-radical-induced 6-exo-dig/5-endo-trig bicyclization, H-abstraction, and diazotization.engArticle