几十年来,基于单电子转移使用 Ni 和 Fe 催化剂体系的烷基卤化物和有机金属物种的交叉偶联已被广泛且分别地研究。在这里,我们展示了氧化还原活性酯(从羧酸中分离和原位衍生)与有机锌和有机镁物种的首次偶联,使用最初为烷基卤化物开发的 Fe 基催化剂体系。这项工作通过展示与 Ni 催化剂的直接比较来放置在上下文中,涉及超过 40 个示例,涵盖一系列初级、二级和三级底物。这种新的 C-C 耦合具有可扩展性和可持续性,并且在某些情况下比其基于 Ni 的耦合表现出许多明显的优势。
Electrophotocatalytic diamination of vicinal C–H bonds
作者:Tao Shen、Tristan H. Lambert
DOI:10.1126/science.abf2798
日期:2021.2.5
carbon-hydrogen (C–H) bonds to carbon–nitrogen (C–N) bonds is a highly valued transformation. Existing strategies typically accomplish such reactions at only a single C–H site because the first derivatization diminishes the reactivity of surrounding C–H bonds. Here, we show that alkylated arenes can undergo vicinal C–H diamination reactions to form 1,2-diamine derivatives through an electrophotocatalytic strategy
Hydrocarbon Activation. Synthesis of β-Cycloalkyl (Di)nitriles through Photosensitized Conjugate Radical Addition
作者:Anna Maria Cardarelli、Maurizio Fagnoni、Mariella Mella、Angelo Albini
DOI:10.1021/jo010400k
日期:2001.11.1
Photoinduced hydrogen abstraction from aliphatic cyclic hydrocarbons (C(5) to C(7), C(12), as well as adamantane) by triplet aromatic ketones in the presence of alpha,beta-unsaturated (di)nitriles offers a straightforward entry to the corresponding alkylated (di)nitriles via the alkyl radicals. Yields are moderate to good depending on the olefins structure (substitution in beta slows down the addition
An efficient method for aromatic Friedel–Crafts alkylation, acylation, benzoylation, and sulfonylation reactions
作者:Ravi P Singh、Rajesh M Kamble、Kusum L Chandra、P Saravanan、Vinod K Singh
DOI:10.1016/s0040-4020(00)01005-x
日期:2001.1
Aromatic electrophilic substitution reactions such as alkylation, acylation, benzoylation, and sulfonylation were studied in the presence of a catalytic amount of Cu(OTf)2 and Sn(OTf)2. Cu(OTf)2 was very efficient for alkylation, acylation, and benzoylation reactions. However, in case of sulfonylation reactions, Sn(OTf)2 gave better results.
Benzene Alkylation with Cycloolefins under the Action of [Et3NH]+[Al2Cl7]− Ionic Liquid
作者:R. I. Aminov、A. S. Mazitova、R. I. Khusnutdinov
DOI:10.1134/s107036321911001x
日期:2019.11
Benzene alkylation with mono- and bicyclic olefins under the action of an inorganic ionic liquid [Et3NH](+)[Al2Cl7](-) with the formation of benzene cycloalkyl derivatives in 58-98% yield has been performed for the first time. It has been found that the increase in the olefin cycle size improves the selectivity with respect to monocycloalkyl derivatives.
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