A Lewis Base Catalysis Approach for the Photoredox Activation of Boronic Acids and Esters
作者:Fabio Lima、Upendra K. Sharma、Lars Grunenberg、Debasmita Saha、Sandra Johannsen、Joerg Sedelmeier、Erik V. Van der Eycken、Steven V. Ley
DOI:10.1002/anie.201709690
日期:2017.11.20
either boronic acids or esters. This system enabled a wide range of alkyl boronic esters and aryl or alkyl boronic acids to react with electron-deficient olefins via radical addition to efficiently form C-C coupled products in a redox-neutral fashion. The Lewis base catalyst was shown to form a redox-active complex with either the boronic esters or the trimeric form of the boronic acids (boroxines) in
Aerobic Oxidative Dehydrogenation of Ketones to 1,4-Enediones
作者:Bao-Yin Zhao、Xing-Long Zhang、Rui-Li Guo、Meng-Yue Wang、Ya-Ru Gao、Yong-Qiang Wang
DOI:10.1021/acs.orglett.0c04174
日期:2021.2.19
An efficient and unprecedented strategy for the synthesis of 1,4-enediones from saturated ketones has been developed via palladium-catalyzedoxidativedehydrogenation. The protocol employs molecular oxygen as the sole oxidant and represents an atom- and step-economic process. The approach showed broad substrate scope, good functional group tolerance, and complete E-stereoselectivity. The reaction mechanism
Samarium Diiodide Mediated Ketyl-Aryl Coupling Reactions - Influence of Substituents and Trapping Experiments
作者:Ulrike K. Wefelscheid、Mathias Berndt、Hans-Ulrich Reißig
DOI:10.1002/ejoc.200800293
日期:2008.7
derivatives as single diastereoisomers in most cases. The position of the substituents was also of crucial influence on the outcome; in several cases ipso-substitution leading to the formation of spiro compounds was observed. Electron-donating substituents at the aromatic moiety are less favourable for the ketyl–aryl couplings. They apparently impede the second electron transfer that is involved in this multi-step
La reduction electrochimique de derives de l'aryl-5 pentanone-2 conduit a des derives de l'(hexahydro-1,2,3,4,6,8a methyl-1) naphtol-1
La 还原电化学 de 衍生 de l'aryl-5 pentanone-2 导管 a des 衍生 de l'(hexahydro-1,2,3,4,6,8amethyl-1)naphtol-1
C(sp<sup>3</sup>)–H bond functionalization with styrenes <i>via</i> hydrogen-atom transfer to an aqueous hydroxyl radical under photocatalysis
作者:Shogo Mori、Susumu Saito
DOI:10.1039/d1gc00753j
日期:——
of α-C–H bonds of acetonitrile and acetone to styrenes was enabled via the hydrogen-atom transfer from relatively acidic and water-miscible C(sp3)–H bonds to an aqueous hydroxyl radical generated cleanly and iteratively by the oxidation of water under silver-nanoparticle-loaded titania photocatalysis without using stoichiometric oxidation agents.