Substitution reactions of organocuprates with .beta.-(phenylseleno)vinyl sulfones derived from the selenosulfonation of acetylenes. A convenient and stereospecific preparation of vinyl sulfones and olefins from acetylenes
A copper-catalyzed three-component coupling reaction of azoles, Se powder, and aryliodide is described for the first time. This transformation provides a straightforward and facile pathway to synthesis 2-arylselanyl-azoles via a copper-catalyzed double C–Se bonds formation process. This reaction is attractive and practical since the cheap copper catalyst is employed and it does not require ligands
Oxidative Coupling of Dichalcogenides with Sodium Sulfinates via Copper-Catalyzed Cleavage of S–S and Se–Se Bonds
作者:Nobukazu Taniguchi
DOI:10.1021/jo5026805
日期:2015.2.6
A copper-catalyzed sulfonylation of disulfides was achieved using sodiumsulfinates in air. The reaction formed various sulfur–sulfone bonds efficiently and afforded thiosulfonates in good yields. Selenosulfonates could also be prepared with this procedure. Furthermore, both chalcogenide groups on the dichalcogenides were available in these reactions.
The first example of copper-catalyzed four-component coupling reaction of aryl iodides, Se powder, secondary amines, and maleimides is developed. This reaction provides an efficient and concise route to access aminoarylselenated maleimides via double C–Se bonds and C–N bond formation. The appealing features of this transformation are the use of Se powder as a selenating reagent, a green catalytic system
heteroarylselenation of indoles employing selenium powder has been developed. The advantages of this chemistry involve the use of cheap selenating reagents, tolerance of a variety of functional groups, and practicality. In addition, this protocol has been further elaborated in an intramolecular phenylselenation of a (hetero) aryl C–H bond to construct an important motif of benzoselenopheno[3,2-b]indole. A preliminary
Weak<i>O</i>-Assistance Outcompeting Strong<i>N</i>,<i>N</i>-Bidentate Directing Groups in Copper-Catalyzed C−H Chalcogenation
作者:Gianpiero Cera、Lutz Ackermann
DOI:10.1002/chem.201601821
日期:2016.6.13
copper‐mediated C−H chalcogenation of triazoles has been achieved by weakcoordination. The user‐friendly protocol showed high functional‐group tolerance and ample substrate scope, yielding fully substituted 1,2,3‐triazoles with complete positional site‐selectivity. The C−H selenylation could likewise be achieved by means of copper catalysis. Our findings highlight for the first time that weakO‐coordination