Mechanism and Selectivity in Nickel-Catalyzed Cross-Electrophile Coupling of Aryl Halides with Alkyl Halides
作者:Soumik Biswas、Daniel J. Weix
DOI:10.1021/ja407589e
日期:2013.10.30
electrophiles, such as an aryl halide with an alkyl halide, offers many advantages over conventional cross-coupling methods that require a carbon nucleophile. Despite its promise as a versatile synthetic strategy, a limited understanding of the mechanism and origin of cross selectivity has hindered progress in reaction development and design. Herein, we shed light on the mechanism for the nickel-catalyzed
与需要碳亲核试剂的传统交叉偶联方法相比,两种不同的亲电子试剂(例如芳基卤化物与烷基卤化物)的直接交叉偶联具有许多优势。尽管它有望成为一种通用的合成策略,但对交叉选择性的机制和起源的有限理解阻碍了反应开发和设计的进展。在此,我们阐明了镍催化芳基卤化物与烷基卤化物的交叉亲电偶联的机制,并证明选择性来自一种不寻常的催化循环,该循环结合了极性和自由基步骤以形成新的 CC 键。