1252763-55-5Relevant articles and documents
Direct C(sp3)–H Sulfonylation of Xanthene Derivatives with Sodium Sulfinates by Oxidative Copper Catalysis
Jiang, Huanfeng,Song, Qinghao,Sun, Yanping,Zhang, Min,Zhao, He
, p. 371 - 377 (2021/12/24)
By employing a readily available CuCl/DDQ catalyst system, we herein report a direct C(sp3)–H sulfonylation of xanthene derivates with odorless sodium sulfinates. Various 9H-xanthenes, thioxanthenes, and 9,10-dihydroacridines are efficiently transformed into the desired benzylic sulfonyl products via a radical/radical cross-coupling process, proceeding with the merits of broad substrate scope, operational simplicity, good functional group compatibility, and mild reaction conditions.
Sulfonic acid-catalyzed autoxidative carbon-carbon coupling reaction under elevated partial pressure of oxygen
Pinter, Aron,Klussmann, Martin
, p. 701 - 711 (2012/04/23)
An aerobic organocatalytic oxidative C-C bond formation reaction of benzylic C-H bonds with various C-nucleophiles is described. The coupling reaction proceeds by simply stirring the substrates under elevated partial pressure of oxygen in the presence of a sulfonic acid catalyst at room temperature. Elevation of the pressure enables the reaction of a broad scope of nucleophile substrates otherwise showing poor reactivity at ambient pressure. The benzylic C-H bonds of xanthene, acridanes, isochromane and related heterocycles could be functionalized with nucleophiles including ketones, 1,3-dicarbonyl compounds and aldehydes. Electron-rich arenes could be utilized as nucleophiles at elevated temperatures. The reactions are believed to proceed via autoxidation of the benzylic C-H bonds to the hydroperoxides and subsequent nucleophilic substitution catalyzed by sulfonic acids. Copyright