介绍了通过维蒂希-霍纳-埃蒙斯反应和迈克尔加成反应形成的各种芳族氟化乙烯基膦酸酯,双和邻位双膦酸酯和三膦酸酯。在碱性催化下迈克尔加成的区域特异性方向在很大程度上取决于乙烯基膦酸酯的取代模式。五氟苯基取代的乙烯基膦酸酯8d与亚磷酸二乙酯反应生成新的三膦酸酯5。该反应序列通过亲核取代取代了C 6 F 5单元的对氟原子,同时发生了膦酸酯基团同时向乙烯基双键的亲核加成。描述了显式NMR研究。
介绍了通过维蒂希-霍纳-埃蒙斯反应和迈克尔加成反应形成的各种芳族氟化乙烯基膦酸酯,双和邻位双膦酸酯和三膦酸酯。在碱性催化下迈克尔加成的区域特异性方向在很大程度上取决于乙烯基膦酸酯的取代模式。五氟苯基取代的乙烯基膦酸酯8d与亚磷酸二乙酯反应生成新的三膦酸酯5。该反应序列通过亲核取代取代了C 6 F 5单元的对氟原子,同时发生了膦酸酯基团同时向乙烯基双键的亲核加成。描述了显式NMR研究。
Palladium-Catalyzed Olefination and Arylation of Polyfluoroarenes Using Molecular Oxygen as the Sole Oxidant
作者:Qiufeng Huang、Xinyu Zhang、Lin Qiu、Jiajun Wu、Hanbing Xiao、Xiaofeng Zhang、Shen Lin
DOI:10.1002/adsc.201500632
日期:2015.11.16
The palladium-catalyzed cross-dehydrogenative-coupling of polyfluoroarenes with alkenes or simple arenes has been developed. The approach is characterized by using atmospheric pressure of molecularoxygen as the sole oxidant, and provides a straightforward and environmentally benign route to functionalized polyfluoroarenes.
A methyl(phenyl)sulfane-promoted direct olefination of polyfluoroarenes catalyzed by palladium has been reported. With use of this new thioether ligand, a high reaction efficiency and excellent E/Z ratio of desired olefinated polyfluoroarenes were obtained. This represents a first example of thioether promoted oxidative Heck reaction.
Pd-catalyzed aerobic direct olefination of polyfluoroarenes
作者:Chun-Yang He、Feng-Ling Qing、Xingang Zhang
DOI:10.1016/j.tetlet.2014.03.096
日期:2014.4
The first example of Pd-catalyzed aerobic direct olefination of polyfluoroarenes has been developed. The reaction makes use of molecular O-2 as terminal oxidant, and provides a cost-efficient and environmentally benign access to polyfluoroarene-alkene structures that are of interest in life and material sciences. (C) 2014 Elsevier Ltd. All rights reserved.
Pd(OAc)<sub>2</sub> Catalyzed Olefination of Highly Electron-Deficient Perfluoroarenes
An efficient, Pd(OAc)(2) catalyzed method for direct olefination of highly electron-deficient perfluoroarenes was developed. The reaction scope includes a series of activated and nonactivated alkenes in moderate to high yields with moderate to high regio- and stereoselectivities.
A novel method for the preparation of fluoroaryl- and fluoroalkyl-substituted bis- and tris-phosphonic acids
作者:R. Classen、G. Hagele
DOI:10.1016/0022-1139(95)03387-4
日期:1996.3
formation of various aromatic fluorinated vinylphosphonates, geminal and vicinal bisphosphonates and trisphosphonates by the Wittig-Horner-Emmons reaction and Michael addition is presented. The regiospecific direction of Michael addition under basic catalysis is largely dependent on the substitution pattern of the vinylphosphonates. The pentafluorophenyl-substituted vinylphosphonate 8d and diethyl phosphite
介绍了通过维蒂希-霍纳-埃蒙斯反应和迈克尔加成反应形成的各种芳族氟化乙烯基膦酸酯,双和邻位双膦酸酯和三膦酸酯。在碱性催化下迈克尔加成的区域特异性方向在很大程度上取决于乙烯基膦酸酯的取代模式。五氟苯基取代的乙烯基膦酸酯8d与亚磷酸二乙酯反应生成新的三膦酸酯5。该反应序列通过亲核取代取代了C 6 F 5单元的对氟原子,同时发生了膦酸酯基团同时向乙烯基双键的亲核加成。描述了显式NMR研究。