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Herein, we report a straightforward synthetic protocol to afford a series of novel Uracil-based bench-stable cyclic hypervalent iodine reagents, Uracil-benziodoxolone ( Uracil-BX). The 3c-4e weak bonds of these hitherto unreported hypervalent iodine reagents were also synthetically exploited for sulfenylation and amination at the C5 position of Uracil via an umpolung strategy. Metal-free approaches for this functionalization at the C5 position lead to various interesting Uracil derivatives that resemble medicinally important molecules.
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http://dx.doi.org/10.1021/acs.orglett.5c02248 | DOI Listing |
Org Lett
September 2025
Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, P. R. China.
A regioselective C3-H alkynylation of triazolopyridazines has been achieved via dual gold/silver catalysis employing hypervalent iodine(III) reagents. The transformation proceeds through an alkynyl Au(III) intermediate and a silver-assisted C-H activation pathway, delivering a broad range of 3-alkynylated triazolopyridazines in good to excellent yields. Mechanistic studies, including H/D exchange experiments, reveal that the silver species plays a crucial role in facilitating C-H activation.
View Article and Find Full Text PDFOrg Lett
August 2025
LAQV@REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.
We describe a new Cu-catalyzed electrophilic amination of rapidly prepared, air-stable polyfunctional organozinc compounds using hypervalent iodine reagents bearing transferable aryl/alkyl amines. A wide range of aryl, heteroaryl, and alkyl amines were prepared. The mechanism of the reaction was investigated using density functional theory calculations.
View Article and Find Full Text PDFAcc Chem Res
August 2025
Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 4306, 1015 Lausanne, Switzerland.
ConspectusAlkynes are one of the most fundamental functional groups in organic synthesis due to the versatile chemistry of the triple bond, their unique rigid structure, and their use in bioconjugation. The introduction of alkynes onto organic molecules traditionally relies on nucleophilic activation, often requiring strong bases or metal catalysts. These conditions, however, restrict applications involving biomolecules such as peptides and proteins due to functional group incompatibility.
View Article and Find Full Text PDFJ Am Chem Soc
August 2025
Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, 3086, Victoria, Australia.
The first C-bound ortho-carborane (oCb) supported hypervalent iodine(III) -IL type species are reported in RoCb-IL, for L = F and OTf, including two structurally verified -IF examples. Initial synthetic observations and supporting theoretical calculations suggest that the new oCb-IL type compounds will be more reactive than any known Ar-IL compound. This is exemplified by a previously unobserved oxidative demethylation of trimethylsilyl fluoride, suggesting that many substrates unreactive toward Ar-IL could be susceptible to oxidation by oCb-IL.
View Article and Find Full Text PDFNat Commun
August 2025
Department of Chemistry, Rice University, Houston, TX, USA.
Hydroazidation of alkenes provides a direct entry to alkyl azides, which are prevalent structural motifs in medicine development and chemical biology probes. While direct access to anti-Markovnikov hydroazidation products has seen recent progress, these protocols are restricted to highly oxidative hypervalent iodine reagents or superstoichiometric metal salts under photochemical conditions with moderate olefin generality. Thus, the development of a mild, catalytic, redox-neutral hydroazidation with high anti-Markovnikov regioselectivity compatible with diverse classes of alkene remains challenging.
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