We report the development of a novel class of glycosyl donors, -diaryl imidates, distinguished by the presence of two identical aryl groups. These DAIs are efficiently synthesized from imidoyl fluorides, which are derived from symmetrical benzophenone precursors. Among the DAIs evaluated, the donor featuring two -fluorophenyl groups exhibits exceptional versatility and efficiency, enabling high-yield glycosylation reactions across a wide range of acceptors. Key intermediates, including imidoyl fluorides and DAI donors, strike an ideal balance between storage stability and reactivity, underscoring their promise for the streamlined synthesis of complex saccharides.
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http://dx.doi.org/10.1021/acs.orglett.5c00105 | DOI Listing |
Org Lett
February 2025
Shanghai Frontiers Science Center of TCM Chemical Biology, Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, China.
We report the development of a novel class of glycosyl donors, -diaryl imidates, distinguished by the presence of two identical aryl groups. These DAIs are efficiently synthesized from imidoyl fluorides, which are derived from symmetrical benzophenone precursors. Among the DAIs evaluated, the donor featuring two -fluorophenyl groups exhibits exceptional versatility and efficiency, enabling high-yield glycosylation reactions across a wide range of acceptors.
View Article and Find Full Text PDFNat Commun
December 2023
State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
Selective defluorinative functionalization of trifluoromethyl group (-CF) is an attractive synthetic route to the pharmaceutically privileged fluorine-containing moiety. Herein, we report a strategy based on photoexcited copper catalysis to activate the C-F bond of di- or trifluoromethylated arenes for divergent radical C-N coupling with carbazoles and aromatic amines. The use of different ligands can tune the reaction products diversity.
View Article and Find Full Text PDFHerein, we report a modified Beckmann rearrangement using sulfone iminium fluoride (SIF) reagents to rapidly synthesize imidoyl fluoride intermediates. Subsequently, amidine and imidate products can be formed following the introduction of amine and alcohol nucleophiles, respectively. Overall, approximately 50 amidine and imidate products have been isolated in high yields utilizing mild conditions.
View Article and Find Full Text PDFOrg Lett
May 2023
Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Fluorination of oximes with the relatively mild diethylaminosulfur trifluoride/tetrahydrofuran (DAST-THF) system affords imidoyl fluorides. These compounds were isolated, and their structures were confirmed by X-ray single-crystal structure analysis. Reaction of imidoyl fluorides with various nucleophiles efficiently afforded amides, amidines, thioamides, and amine derivatives in high yields.
View Article and Find Full Text PDFJ Org Chem
June 2023
Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea.
Organoazide rearrangement constitutes versatile synthetic strategies but typically requires an extremely strong acid and/or a high reaction temperature. Our group recently discovered the remarkable accelerating effect of the geminal fluorine substituent that enables the facile rearrangement of azides into imidoyl fluorides without the aid of acid under much milder reaction conditions. The role of geminal fluorine was elucidated by both experimental and computational investigations.
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