Iron-Catalyzed Suzuki–Miyaura Cross-Coupling Reactions between Alkyl Halides and Unactivated Arylboronic Esters
作者:Michael P. Crockett、Chet C. Tyrol、Alexander S. Wong、Bo Li、Jeffery A. Byers
DOI:10.1021/acs.orglett.8b02184
日期:2018.9.7
An iron-catalyzed cross-coupling reaction between alkylhalides and arylboronic esters was developed that does not involve activation of the boronic ester with alkyllithium reagents nor requires magnesium additives. A combination of experimental and theoretical investigations revealed that lithium amide bases coupled with iron complexes containing deprotonated cyanobis(oxazoline) ligands were best
We report nickel-catalyzed cross-coupling of methoxyarenes with alkylmagnesium halides, in which a methoxy group is eliminated. A wide range of alkyl groups, including those bearing β-hydrogens, can be introduced directly at the ipso position of anisole derivatives. We demonstrate that the robustness of a methoxy group allows this alkylation protocol to be used to synthesize elaborate molecules by
我们报告了镍催化的甲氧基芳烃与烷基卤化镁的交叉偶联,其中甲氧基被消除。广泛的烷基,包括那些带有 β-氢的烷基,可以直接在苯甲醚衍生物的 ipso 位置引入。我们证明甲氧基的稳健性允许该烷基化方案通过将其与传统的交叉偶联反应或氧化转化相结合来合成复杂的分子。这种方法的成功取决于使用烷基碘化镁,而不是氯化物或溴化物,这突出了卤化物在使用格氏试剂进行催化反应中的重要性。
757. Alkylation of the aromatic nucleus. Part XIV. Naphthalene