A catalytic metal-free Ritter reaction to 3-substituted 3-aminooxindoles
作者:Feng Zhou、Miao Ding、Jian Zhou
DOI:10.1039/c2ob25319d
日期:——
The first Ritter reaction of 3-substituted 3-hydroxyoxindoles with nitriles, catalyzed by HClO4, is developed, which enables the synthesis of 3-substituted 3-aminooxindoles in good to excellent yield with rich diversity.
Accessing 1,3-Dienes via Palladium-Catalyzed Allylic Alkylation of Pronucleophiles with Skipped Enynes
作者:Shang Gao、Hao Liu、Chi Yang、Zhiyuan Fu、Hequan Yao、Aijun Lin
DOI:10.1021/acs.orglett.7b01960
日期:2017.9.15
An unprecedented palladium-catalyzed allylic alkylation of pronucleophiles with unactivated skipped enynes has been developed. This method provides a straightforward access to a wide array of 1,3-dienes without the need to preinstall leaving groups or employ extra oxidants. The reaction exhibited high atom economy, good functional group tolerance, excellent regioselectivities, and scalability. With
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.