Regioselective Ruthenium-Catalyzed Direct Benzylations of Arenes through C−H Bond Cleavages
摘要:
Highly regioselective ruthenium-catalyzed direct benzylations through C-H bond cleavages were accomplished under remarkably mild, nonacidic reaction conditions, for which experimental studies suggested a SEAr-type mechanism not to be operative.
α-Halo carbonyls enable meta selective primary, secondary and tertiary C–H alkylations by ruthenium catalysis
作者:Andrew J. Paterson、Callum J. Heron、Claire L. McMullin、Mary F. Mahon、Neil J. Press、Christopher G. Frost
DOI:10.1039/c7ob01192j
日期:——
selective C–H alkylation of arenes is described using a wide range of α-halo carbonyls as coupling partners. Previously unreported primary alkylations with high meta selectivity have been enabled by this methodology whereas using straight chain alkyl halides affords ortho substituted products. Mechanistic analysis reveals an activation pathway whereby cyclometalation with a ruthenium(II) complex activates
meta-Selective C–H Bond Alkylation with Secondary Alkyl Halides
作者:Nora Hofmann、Lutz Ackermann
DOI:10.1021/ja401466y
日期:2013.4.17
Ruthenium catalysts enabled C-Hbond functionalizations on arenes with challenging secondary alkyl halides. Particularly, ruthenium(II) biscarboxylate complexes proved to be the key to success for direct alkylations with excellent levels of unusual meta-selectivity. The direct alkylations occurred under mild reaction conditions with ample scope and tolerated valuable functional groups. Detailed mechanistic
钌催化剂使具有挑战性的仲烷基卤化物的芳烃上的 CH 键官能化成为可能。特别是,钌 (II) 双羧酸配合物被证明是直接烷基化成功的关键,具有出色的不寻常的间位选择性。直接烷基化发生在温和的反应条件下,具有足够的范围和可耐受的有价值的官能团。进行了详细的机理研究,包括各种竞争实验以及与同位素标记底物的反应。这些研究为最初的可逆环金属化提供了强有力的支持。环钌化从而活化芳烃,用于随后用仲烷基卤化物进行远程亲电型取代。
Carboxylate-Assisted Ruthenium(II)-Catalyzed Hydroarylations of Unactivated Alkenes through C-H Cleavage
作者:Marvin Schinkel、Ilan Marek、Lutz Ackermann
DOI:10.1002/anie.201208446
日期:2013.4.2
Catalytic: Ruthenium(II)biscarboxylate complexes enabled highly effective hydroarylations of unactivatedalkenesthrough CH bond activation. This method has a broad substrate scope and allowed for versatile functionalizations of highly fluorinated alkenes.
Pyrene-Based Mono- and Di-N-Heterocyclic Carbene Ligand Complexes of Ruthenium for the Preparation of Mixed Arylated/Alkylated Arylpyridines
作者:Sergio Gonell、Eduardo Peris
DOI:10.1021/cs500735u
日期:2014.8.1
di-N-heterocyclic carbene ligands, two rutheniumcomplexes (one monometallic and the other dimetallic) have been obtained and fully characterized. The molecular structure of the dimetallic complex has been determined by means of X-ray diffraction studies. The electrochemical studies reveal that the metal–metal communication in the dimetallic complex is weak. The catalytic activity of both complexes has been
Cut to the chase: A ruthenium complex derived from 1‐adamantyl carboxylate (1‐AdCO2−) enabled highly regioselective intermolecular directalkylation of arenes with unactivated primary and secondary alkyl halides bearing β‐hydrogen atoms (see scheme; NMP=N‐methylpyrrolidinone).