Expedient Iron-Catalyzed Coupling of Alkyl, Benzyl and Allyl Halides with Arylboronic Esters
作者:Robin B. Bedford、Peter B. Brenner、Emma Carter、Thomas W. Carvell、Paul M. Cogswell、Timothy Gallagher、Jeremy N. Harvey、Damien M. Murphy、Emily C. Neeve、Joshua Nunn、Dominic R. Pye
DOI:10.1002/chem.201402174
日期:2014.6.23
While attractive, the iron‐catalyzed coupling of arylboron reagents with alkyl halides typically requires expensive or synthetically challenging diphosphine ligands. Herein, we show that primary and secondary alkyl bromides and chlorides, as well as benzyl and allyl halides, can be coupled with arylboronic esters, activated with alkyllithium reagents, by using very simple iron‐based catalysts. The
尽管很有吸引力,但芳基硼试剂与烷基卤化物的铁催化偶联通常需要昂贵或合成难度高的二膦配体。本文中,我们表明伯和仲烷基溴化物和氯化物,以及苄基和烯丙基卤化物,可以通过使用非常简单的铁基催化剂与被烷基锂试剂活化的芳基硼酸酯偶联。所使用的催化剂要么是廉价且广泛使用的二膦的加合物,要么在很多情况下是简单的[Fe(acac)3 ],而没有添加共配体。在前一种情况下,初步的机理研究突显了铁(I)-膦中间体可能参与其中。