oxindole synthesis bearing an all-carbon quaternary center, enabled by Pd-catalyzed intramolecular cyclization followed by multiple intermolecular Heck reactions of both easily accessible alkene-tethered carbamoyl chlorides and olefins. This protocol obviates the use of prefunctionalized olefinic reagents, exhibits excellent functional group tolerance, and features fascinating reactive versatility.
Copper-Catalyzed Oxidative Amination and Allylic Amination of Alkenes
作者:Timothy W. Liwosz、Sherry R. Chemler
DOI:10.1002/chem.201301800
日期:2013.9.16
enamides are useful synthetic intermediates and common components of bioactive compounds. A new protocol for their direct synthesis by a net alkene CHamination and allylic amination by using catalytic CuII in the presence of MnO2 is reported. Reactions between N‐aryl sulfonamides and vinyl arenes furnish enamides, allylic amines, indoles, benzothiazine dioxides, and dibenzazepines directly and efficiently
烯胺和烯酰胺是有用的合成中间体和生物活性化合物的常见成分。报道了在 MnO 2存在下使用催化 Cu II通过净烯烃 C H 胺化和烯丙基胺化直接合成它们的新方案。 N-芳基磺酰胺和乙烯基芳烃之间的反应直接有效地生成烯酰胺、烯丙胺、吲哚、二氧化苯并噻嗪和二苯并氮杂卓。对照实验进一步表明,在没有铜盐的情况下,单独的MnO 2可以促进反应,尽管效率较低。机理探针支持氮自由基中间体的参与。该方法非常适合从 1,1-二取代乙烯基芳烃合成烯酰胺,1,1-二取代乙烯基芳烃是现有氧化胺化方案中不常见的底物。
Hydrogen-free palladium-catalyzed intramolecular anti-Markovnikov hydroaminocarbonylation of 2-(1-methylvinyl)anilines
palladium-catalyzed intramolecular hydroaminocarbonylation of 2-(1-methylvinyl)aniline derivatives has been achieved using dppp (1,3-bis(diphenylphosphino)propane) as a ligand under hydrogen-free conditions. The reaction involves the generation of an active palladium hydride species with a catalytic amount of TsOH. This amide bond formation reaction was applied to the synthesis of various 4-substituted 3,4-dihydroquinolone
A convenient synthetic method for 1-aryl-1H-indole derivatives has been developed. 2-(Arylamino)-α-methylstyrene derivatives were treated with iodine in the presence of sodium hydrogencarbonate to ...
Copper-Catalyzed Synthesis of N-Aryl and N-Sulfonyl Indoles from 2-Vinylanilines with O2 as Terminal Oxidant and TEMPO as Cocatalyst
作者:Sherry Chemler、Timothy Liwosz
DOI:10.1055/s-0034-1379015
日期:——
A copper-catalyzed intramolecular alkene oxidative amination that utilizes TEMPO as co-catalyst and O2 as the terminal oxidant has been developed. The method furnishes N-aryl and N-sulfonyl indoles from N-aryl and N-sulfonyl 2-vinylanilines, respectively. Additionally, sequential copper-catalyzed reactions where initial Chan-Lam coupling of 2-vinylanilines with arylboronic acids is followed by oxidative amination of the alkene can generate N-aryl indoles in one pot.