N-Protected trifluoromethyl-substituted sulfoximines have been prepared by treatment of sulfonimidoyl fluorides with a combination of the Ruppert-Prakash reagent (TMSCF(3)) and tetrabutyl ammonium fluoride (TBAF). The starting materials were accessed following two synthetic routes, and for each reaction sequence the substrate scope was evaluated. Accordingly, a wide variety of aryl-substituted products were obtained in moderate to good yield.
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http://dx.doi.org/10.1021/ol103030w | DOI Listing |
Angew Chem Int Ed Engl
November 2024
Chengdu Institution of Biology, Chinese Academy of Science, Chengdu, Sichuan, 610041, China.
Sulfur-centered electrophilic 'warheads' have emerged as key components for chemical proteomic probes through sulfur-exchange chemistry (SuFEx) with protein nucleophiles. Among these functional groups, sulfonimidoyl fluorides (SIFs) stand out for their modifiable sites, tunable electrophilicities, and chiral sulfur-center, presenting exciting possibilities for new covalent chemical probes. However, the synthetic access to chiral SIFs has been a challenge, limiting their exploration and applications.
View Article and Find Full Text PDFJ Org Chem
November 2024
Department of Chemistry, National Institute of Technology, Tiruchirappalli, Tamilnadu 620015, India.
We develop a rapid and mild protocol to access sulfonimidoyl fluoride-[S(VI)] from sulfenamide-[S(II)] directly. The transformation occurs via the reaction of sulfenamide with NCS (-chlorosuccinimide), water, and TBAF in acetonitrile. Water and TBAF act as the source for S═O bond formation and fluoride, respectively.
View Article and Find Full Text PDFJ Am Chem Soc
July 2024
Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai 200438, China.
The application of sulfinamides has been witnessed in medicinal and agrochemistry with employment in asymmetric transformations. However, methods for their asymmetric catalytic synthesis have rarely been explored. Herein, the catalytic enantioselective addition of aryl boroxines to sulfinylamines via Cu catalyst and the newly developed Xuphos ligand were reported.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
September 2024
Laboratory of Organic Chemistry, Wageningen University, Stippeneng 4, Wageningen, 6708 WE, The Netherlands.
S(VI) compounds with multiple N or O substituents are often difficult to make and several crucial routes, such as multimodal SuFEx (Sulfur (VI) Fluoride Exchange) chemistry, rely on the highly useful but hazardous SOF gas. Safety issues and inaccessibility of SOF strongly hamper the developments of these organic compounds. Here we describe the synthesis and applications of 2-methylimidazole-1-(N-tert-octyl)sulfonimidoyl fluoride (ImSF), a novel bench-stable analogue of SOF.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
June 2024
Department of Chemistry, Sustainable Chemistry for Metals and Molecules (SCM2), KU Leuven Department of Chemistry, Celestijnenlaan 200F-box 2404, B-3001, Leuven, Belgium.
Sulfur(VI) Fluoride Exchange (SuFEx) chemistry stands as a well-established method for swiftly constructing complex molecules in a modular fashion. An especially promising segment of this toolbox is reserved for multidimensional SuFEx hubs: three or more substituents pluggable into a singular S centre to make 'beyond-linear' clicked constructions. Sulfurimidoyl difluorides (RNSOF) stand out as the prime example of this, however their preparation from the scarcely available thionyl tetrafluoride (SOF) limits this chemistry to only a few laboratories with access to this gas.
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