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Herein, we for the first time synthesize a bench-stable cross-coupling reagent, uracil-TT+BF4\u2013, for Sonogashira-type reaction to install an alkyne functionality selectively at position C-5 of uracils. A series of terminal alkynes were tolerated well, affording the desired products in good to excellent yields. Moreover, mild conditions, low catalyst loading, a broad substrate scope, and excellent functional group tolerance are some notable features of the current protocol. Furthermore, byproduct thianthrene (TT) formed in this reaction has been recovered and reused for making the uracil-TT+ reagent, highlighting the sustainability of the method.<\/jats:p>","DOI":"10.1021\/acs.orglett.6c03078","type":"journal-article","created":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T02:02:05Z","timestamp":1789610525000},"page":"11861-11866","source":"Crossref","is-referenced-by-count":0,"title":["Uracil-Thianthrenium\nSalts (Uracil-TT+BF4\u2013) as\na Coupling Partner in Sonogashira\nCross-Coupling Reactions: Access to 5-Alkynyl Uracils and Synthetic\nApplications"],"prefix":"10.1021","volume":"28","author":[{"given":"Surendra","family":"Saini","sequence":"first","affiliation":[{"name":"CSIR-Central Drug Research Institute , , , ,","place":["Lucknow, U.P., India, 226031"]},{"name":"Academy of Scientific and Innovative Research (AcSIR) , ,","place":["Ghaziabad, India, 201002"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Santu","family":"Das","sequence":"additional","affiliation":[{"name":"CSIR-Central Drug Research Institute , , , ,","place":["Lucknow, U.P., India, 226031"]},{"name":"Academy of Scientific and Innovative Research (AcSIR) , ,","place":["Ghaziabad, India, 201002"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6626-045X","authenticated-orcid":true,"given":"Nayan","family":"Ghosh","sequence":"additional","affiliation":[{"name":"CSIR-Central Drug Research Institute , , , ,","place":["Lucknow, U.P., India, 226031"]},{"name":"Academy of Scientific and Innovative Research (AcSIR) , ,","place":["Ghaziabad, India, 201002"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,16]]},"reference":[{"key":"2026092510103491800_cit1a","doi-asserted-by":"publisher","first-page":"9428","DOI":"10.1021\/jacs.3c01611","article-title":"Programmable DNA Interstrand Crosslinking by Alkene\u2013Alkyne\n[2 + 2] Photocycloaddition","volume":"145","author":"Neitz","year":"2023","journal-title":"J. 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