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Here, we overturn this paradigm by introducing a sulfoximine-based cyclic iodine(III) platform that enables direct scaffold incorporation into the final product. Under copper catalysis, the triflate hypervalent iodine(III) reagents undergo annulation with terminal alkynes to deliver benzo[d]isothiazole-1-oxides with broad functional group tolerance. The synthetic utility of this scaffold-incorporating strategy is further underscored by the identification of compound 3v as a micromolar ferroptosis inhibitor in cellular assays, demonstrating that this method can readily generate biologically relevant molecules with potential for further biological evaluation.<\/jats:p>","DOI":"10.1021\/acs.orglett.6c02714","type":"journal-article","created":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T13:21:37Z","timestamp":1785849697000},"page":"10271-10276","source":"Crossref","is-referenced-by-count":1,"title":["Copper-Catalyzed\nCyclization of Alkynes with Cyclic\nIodine(III) Sulfoximines: Access to Benzo[\n                    <i>d<\/i>\n                    ]isothiazole-1-oxides"],"prefix":"10.1021","volume":"28","author":[{"given":"Jian-Xing","family":"Xu","sequence":"first","affiliation":[{"name":"Hangzhou Medical College , , ,","place":["Hangzhou, P.R. 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