Copper-catalyzed preparation of <i>N</i>-aroylated sulfoximines from methylarenes
作者:Anguo Hou、Zijian Zhao
DOI:10.1080/00397911.2017.1318444
日期:2017.7.3
ABSTRACT A copper-catalyzed methodology for the preparations of N-aroylated sulfoximines from methylarenes was herein demonstrated. The transformation proceeded with the assistance of external oxidant tert-butyl hydroperoxide, requiring for no additional solvents or ligands. The good compatibility and high efficiency of the newly developed protocol were well described by 21 examples and up to 91% yields
Sulfoximines: A Reusable Directing Group for Chemo- and Regioselective ortho CH Oxidation of Arenes
作者:M. Ramu Yadav、Raja K. Rit、Akhila K. Sahoo
DOI:10.1002/chem.201200092
日期:2012.4.27
Sulfoximinesdirect: A new protocol for the chemo‐ and regioselectiveorthoCH acetoxylation of arenes in N‐benzoylated sulfoximines is reported. The sulfoximinedirectinggroup is easily detached from the CHoxidation product through acid‐promoted hydrolysis, isolated, and reused (see scheme). The meta‐substituted phenols are synthesized following this strategy and the stereointegrity of the sulfoximine
Ruthenium(II)-Catalyzed C–H Oxygenations of Reusable Sulfoximine Benzamides
作者:Keshav Raghuvanshi、Daniel Zell、Lutz Ackermann
DOI:10.1021/acs.orglett.6b03898
日期:2017.3.17
C–H oxygenations of synthetically meaningful sulfoximine benzamides were accomplished by a versatileruthenium catalysis regime. The ruthenium(II) catalyst was characterized by excellent mono- and chemoselectivity as well as positional selectivity via facile base-assisted intramolecular electrophilic substitution-type (BIES) C–Hactivation. The synthetic utility of the approach was reflected by high
precursors in reactions with thioethers under the catalysis of a commercially available Ru(II) complex, from which a variety of sulfimides were synthesized efficiently and mildly. If an allyl group is contained in the thioether precursor, the [2,3]-sigmatropic rearrangement of the sulfimide occurs simultaneously and the N-allyl-N-(thio)amides were obtained as the final products. Preliminary mechanistic studies
Interweaving Visible‐Light and Iron Catalysis for Nitrene Formation and Transformation with Dioxazolones
作者:Jing‐Jing Tang、Xiaoqiang Yu、Yi Wang、Yoshinori Yamamoto、Ming Bao
DOI:10.1002/anie.202016234
日期:2021.7.19
transfer reactions with dioxazolones for intermolecular C(sp3)-N, N=S, and N=P bond formation are described. These reactions occur with exogenous-ligand-free process and feature satisfactory to excellent yields (up to 99 %), an ample substrate scope (109 examples) under mild reaction conditions. In contrast to intramolecular C−H amidations strategies, an intermolecular regioselective C−H amidation via