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。
[EN] PROCESS FOR FORMING A CARBON-CARBON BOND<br/>[FR] PROCÉDÉ DE FORMATION D'UNE LIAISON CARBONE-CARBONE
申请人:UNIV MANCHESTER
公开号:WO2019215427A1
公开(公告)日:2019-11-14
A process for forming a carbon-carbon bond to couple an aryl or heteroaryl group of a first compound with an alkyl or cycloalkyl moietyof a second compound, the process comprising reacting the first compound with the second compound in the presence of a catalytically effective amount of a neutral or cationic ruthenium(II) catalyst of formula (I).
Visible‐light‐induced ruthenium catalysis has enabled remote C−Halkylations with excellent levels of position control under exceedingly mild conditions at roomtemperature. The metallaphotocatalysis occurred under exogenous‐photosensitizer‐free conditions and features an ample substrate scope. The robust nature of the photo‐induced mild meta‐C−H functionalization is reflected by the broad functional
C−H Activation Based Copper‐Catalyzed One‐Shot Synthesis of N,O‐Bidentate Organic Difluoroboron Complexes
作者:Guangying Tan、Malte L. Schrader、Constantin Daniliuc、Felix Strieth‐Kalthoff、Frank Glorius
DOI:10.1002/anie.202008311
日期:2020.11.23
Organic BF2 complexes exhibit characteristics such as large Stokes shift, high quantum yield, strong emission intensity, and robust chemical stability, thereby being extensively used in various applications. Herein, we disclose a novel copper‐catalyzed cascade C−H activation/acyloxylation and difluoroboronation of 2‐phenylpyridine derivatives, thus providing a straightforward and rapid gateway to a