An enantioconvergent substitution of 3-substituted 3-chlorooxindoles with N-aryl glycines under visible light irradiation is reported. A transition-metal-free cooperative catalysis platform with a dicyanopyrazine-derived chromophore (DPZ) as a photoredox catalyst and a chiral Brønsted acid catalyst is effective for these transformations, which involve a single-electron transfer redox step and an enantioselective
Copper-Catalyzed Asymmetric Propargylic Alkylation with Oxindoles: Diastereo- and Enantioselective Construction of Vicinal Tertiary and All-Carbon Quaternary Stereocenters
作者:Jin-Tao Xia、Xiang-Ping Hu
DOI:10.1021/acs.orglett.9b04621
日期:2020.2.7
stereoselective construction of vicinal tertiary and all-carbon quaternary stereocenters in a 3,3-disubstituted oxindole skeleton has been realized. The reaction proceeded smoothly under the catalysis of Cu(MeCN)4PF6 combined with a chiral tridentateferrocenyl P,N,N ligand, leading to a broad range of optically active 3,3-disubstituted oxindoles in high yields and with excellent diastereo- and enantioselectivities
Palladium-Catalyzed Allylation of Cyclopropyl Acetylenes with Oxindoles to Construct 1,3-Dienes
作者:Chuan-Jun Lu、Xin Yu、Yu-Ting Chen、Qing-Bao Song、Zhen-Ping Yang、Hong Wang
DOI:10.1002/ejoc.201901536
日期:2020.2.14
A novel palladium‐catalyzed allylic alkylation of oxindoles with cyclopropylacetylenes has been developed. Various 1,3‐diene oxindole framework bearing a quaternary stereocenter at the C3 position were synthesized straightforwardly in good to excellent yields with high regio‐, and stereoselectivities.
Mo-Catalyzed Regio-, Diastereo-, and Enantioselective Allylic Alkylation of 3-Aryloxindoles
作者:Barry M. Trost、Yong Zhang
DOI:10.1021/ja0755717
日期:2007.11.28
A highly regio-, diastereo-, and enantioselective allylic alkylation reaction mediated by a chiral molybdenum catalyst has been developed as a novel entry into synthetically versatile 3-alkyl-3-aryloxindoles. Extremelybulky nucleophiles were employed to form a quaternary center and an adjacent tertiary center asymmetrically concurrently. The regio- and diastereoselectivity of the reaction is dependent
作者:Amrah Nasim、Gilian T. Thomas、Jeffrey S. Ovens、Stephen G. Newman
DOI:10.1021/acs.orglett.2c03042
日期:2022.10.7
We report an intermolecular Ni-catalyzed reductive coupling of aryl iodides and isatins to form 3-hydroxyoxindoles. In contrast to common metal-mediated methods, sec-butanol is used as a mild stoichiometric reductant resulting in benign waste products. This formal 1,2-addition reaction is facilitated by a 1,5-diaza-3,7-diphosphacyclooctane (P2N2) ligand. Two Ni(0)–P2N2 species are prepared and found
我们报告了芳基碘化物和靛红的分子间 Ni 催化还原偶联形成 3-羟基羟吲哚。与常见的金属介导方法相比,仲丁醇用作温和的化学计量还原剂,产生良性废物。这种正式的 1,2-加成反应由 1,5-二氮杂-3,7-二磷环辛烷 (P 2 N 2 ) 配体促进。制备了两种 Ni(0)–P 2 N 2物质,发现它们具有催化活性,这支持了该反应通过修饰的羰基-Heck 型途径进行的机制假设。