Nickel‐Mediated Photoreductive Cross Coupling of Carboxylic Acid Derivatives for Ketone Synthesis**
作者:Jan Brauer、Elisabeth Quraishi、Lisa Marie Kammer、Till Opatz
DOI:10.1002/chem.202103486
日期:2021.12.23
Mediated synthesis: A strategy for the nickel-catalyzed synthesis of ketones using visible light and two carboxylic acid-derived substrates is presented. No expensive iridium catalysts are required, with eco-friendly Hantzsch ester acting as both the photosensitizer and photoreductant. A broad scope of synthesized ketones is presented along with spectroscopical and computational studies of the role
Synergistic Visible-Light Photoredox/Nickel-Catalyzed Synthesis of Aliphatic Ketones via N–C Cleavage of Imides
作者:Javad Amani、Rauful Alam、Shorouk Badir、Gary A. Molander
DOI:10.1021/acs.orglett.7b00989
日期:2017.5.5
An electrophilic, imide-based, visible-light-promoted photoredox/Ni-catalyzed cross-coupling reaction for the synthesis of aliphatic ketones has been developed. This protocol proceeds through N–C(O) bond activation, made possible through the lower activation energy for metal insertion into this bond due to delocalization of the lone pair of electrons on the nitrogen by electron-withdrawing groups.
Synergistic Photoredox/Nickel Coupling of Acyl Chlorides with Secondary Alkyltrifluoroborates: Dialkyl Ketone Synthesis
作者:Javad Amani、Gary A. Molander
DOI:10.1021/acs.joc.6b02897
日期:2017.2.3
Visiblelightphotoredox/nickel dual catalysis has been employed in the cross-coupling of acyl chlorides with potassium alkyltrifluoroborates. This protocol, based on single-electron-mediated alkyl transfer, circumvents the restriction of using reactive alkylmetallic nucleophiles in transition-metal-catalyzed acylation and achieves a mild and efficient method for the synthesis of unsymmetrical alkyl
Vinyl Triflate–Aldehyde Reductive Coupling–Redox Isomerization Mediated by Formate: Rhodium‐Catalyzed Ketone Synthesis in the Absence of Stoichiometric Metals
作者:William G. Shuler、Robert A. Swyka、Tabitha T. Schempp、Brian J. Spinello、Michael J. Krische
DOI:10.1002/chem.201903668
日期:2019.9.25
Direct conversion of aldehydes to ketones is achieved via rhodium-catalyzed vinyl triflate-aldehyde reductive coupling-redox isomerization mediated by potassium formate. This method circumvents premetalated C-nucleophiles and discrete redox manipulations typically required to form ketonesfrom aldehydes.
Site‐selective Hydrogenation/Deuteration of Benzylic Olefins Enabled by Electroreduction Using Water
作者:Simon Kolb、Daniel B. Werz
DOI:10.1002/chem.202300849
日期:——
Electroreduction of benzylicolefins has been applied to site-selectively hydrogenate such double bonds while other functions that react under regular hydrogenation conditions are present. By the use of water as proton source this protocol also allows deuteration by simply switching to D2O. The applicability of this method was shown by the use of a commercially available electrolysis setup and a broad
苄基烯烃的电还原已应用于位点选择性氢化此类双键,同时存在在常规氢化条件下反应的其他功能。通过使用水作为质子源,该协议还允许通过简单地切换到 D 2 O 进行氘化。该方法的适用性通过使用商用电解装置和广泛的底物范围得到证明。