The contra-thermodynamic isomerization of α- and β-substituted cinnamate derivatives catalyzed by the Cu(OAc)2/rac-BINAP complex under blue light irradiation is reported. The use of an oxazolidinone template, which favored the complexation of the copper catalyst to the substrate, allowed the E → Z isomerization of the catalytically formed chromophore under simple and robust reaction conditions in good
Carboxylative Cyclization of 2-Butenoates with Carbon Dioxide: Access to Glutaconic Anhydrides
作者:Ke Zhang、Wen-Zhen Zhang、Xue-Yan Tao、Min Zhang、Wei-Min Ren、Xiao-Bing Lu
DOI:10.1021/acs.joc.0c01717
日期:2020.9.4
Cyclic anhydrides are versatile synthons and functional comonomers. Herein, we reported an organic base-promoted carboxylative cyclization of 2-butenoates with carbon dioxide to produce important glutaconic anhydrides in good yields. This metal-free reaction showed broad substrate scopes and proceeded under mild reaction conditions.
Pd(II)/Bipyridine-Catalyzed Conjugate Addition of Arylboronic Acids to α,β-Unsaturated Carboxylic Acids. Synthesis of β-Quaternary Carbons Substituted Carboxylic Acids
作者:Rui Liu、Zhenyu Yang、Yuxin Ni、Kaixuan Song、Kai Shen、Shaohui Lin、Qinmin Pan
DOI:10.1021/acs.joc.7b01248
日期:2017.8.4
Pd(II)/bipyridine-catalyzed conjugate addition of arylboronic acids to α,β-unsaturatedcarboxylicacids (including β,β-disubstituted acrylic acids) was developed and optimized, which provided a mild and convenient method for the highly challenging synthesis of β-quaternary carbons substituted carboxylicacids.
Redox-Neutral Photocatalytic C−H Carboxylation of Arenes and Styrenes with CO2
作者:Matthias Schmalzbauer、Thomas D. Svejstrup、Florian Fricke、Peter Brandt、Magnus J. Johansson、Giulia Bergonzini、Burkhard König
DOI:10.1016/j.chempr.2020.08.022
日期:2020.10
Carbondioxide (CO2) is an attractive one-carbon (C1) building block in terms of sustainability and abundance. However, its low reactivity limits applications in organic synthesis as typically high-energy reagents are required to drive transformations. Here, we present a redox-neutral C─H carboxylation of arenes and styrenes using a photocatalytic approach. Upon blue-light excitation, the anthrolate
Copper-Catalyzed Di- and Trifluoromethylation of α,β-Unsaturated Carboxylic Acids: A Protocol for Vinylic Fluoroalkylations
作者:Zhengbiao He、Tao Luo、Mingyou Hu、Yanjing Cao、Jinbo Hu
DOI:10.1002/anie.201200140
日期:2012.4.16
Dual action: The Lewis acid CuF2⋅2 H2O efficiently catalyzes the reaction between electrophilic fluoroalkylating agents and α,β‐unsaturated carboxylic acids by dually activating both reactants, thus affording di‐ and trifluoromethyl alkenes in high yields with excellent E/Z selectivity.