Photoredox-Catalysed Decarboxylative Alkylation of N-Heteroarenes with <i>N</i>
-(Acyloxy)phthalimides
作者:Wan-Min Cheng、Rui Shang、Ming-Chen Fu、Yao Fu
DOI:10.1002/chem.201605640
日期:2017.2.21
catalyst in combination with either a stoichiometric amount of Brønsted acid or a catalytic amount of Lewis acid is capable of catalyzingregioselective alkylation of N‐heteroarenes with N‐(acyloxy)phthalimides at room temperature under irradiation. A broad range of N‐heteroarenes can be alkylated using a variety of secondary, tertiary, and quaternary carboxylates. Mechanistic studies suggest that an IrII/IrIII
铱光氧化还原催化剂与化学计量的布朗斯台德酸或催化量的路易斯酸结合使用,能够在室温下于辐射下催化N-(酰氧基)邻苯二甲酰亚胺对N-杂芳烃的区域选择性烷基化。可以使用各种仲,叔和季羧酸盐将多种N-杂芳烃烷基化。机理研究表明,Ir II / Ir III氧化还原催化循环是所观察到的反应性的原因。
Decarboxylative 1,4-carbocyanation of 1,3-enynes to access tetra-substituted allenes <i>via</i> copper/photoredox dual catalysis
作者:Ya Chen、Junjie Wang、Yixin Lu
DOI:10.1039/d1sc02896k
日期:——
An efficient synthesis of multi-substituted allenes by metallaphotoredox-catalyzed decarboxylative 1,4-carbocyanation of 1,3-enynes is described.
一种高效的方法通过金属光还原催化的脱羧1,4-碳氰化反应合成多取代联烯。
The photoredox alkylarylation of styrenes with alkyl <i>N</i>-hydroxyphthalimide esters and arenes involving C–H functionalization
作者:Xia Wang、Ya-Fei Han、Xuan-Hui Ouyang、Ren-Jie Song、Jin-Heng Li
DOI:10.1039/c9cc07494e
日期:——
alkylarylation of styrenes with alkyl NHP esters and arenes to access alkylated arene derivatives through C-C bond cleavage and C-H functionalization is reported. By utilizing visible-light photoredox catalysis, alkyl N-hydroxyphthalimide esters serving as alkyl carbon-centered radicals and a wide range of arenes (e.g., indoles, pyrrole, and electron-rich arenes) as nucleophiles were used to enable the introduction
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
Metal-free, visible-light-mediated, decarboxylative alkylation of biomass-derived compounds
作者:Johanna Schwarz、Burkhard König
DOI:10.1039/c6gc01101b
日期:——
This work describes a mild, environmentally friendly method to activate natural carboxylic acids for decarboxylativealkylation. After esterification of biomass-derived acids to N-(acyloxy)phthalimides, the active esters are cleaved reductively by...