Cobalt-Catalyzed Cross-Coupling Reactions of Heterocyclic Chlorides with Arylmagnesium Halides and of Polyfunctionalized Arylcopper Reagents with Aryl Bromides, Chlorides, Fluorides and Tosylates
作者:Paul Knochel、Tobias Korn、Matthias Schade、Murthy Cheemala、Stefan Wirth、Simon Guevara、Gérard Cahiez
DOI:10.1055/s-2006-950290
日期:2006.11
A range of aromatic organocopper or organomagnesium compounds undergo smooth cross-coupling reactions with aryl bromides, chlorides, fluorides and tosylates, leading to polyfunctionalized aromatics or heterocycles in the presence of cobalt salts (5-7.5 mol%) as catalysts. Very mild reaction conditions are needed and, in the case of cross-coupling with organocopper compounds, Bu4NI (1 equiv) and 4-fluorostyrene (20 mol%) are essential as promoters for successful couplings.
一系列芳香族有机铜或有机镁化合物与芳基溴、氯、氟及托烯磺酸酯进行平滑的交叉偶联反应,在钴盐(5-7.5 mol%)作为催化剂的情况下,产生多功能化的芳香族化合物或杂环化合物。反应条件非常温和,且在与有机铜化合物交叉偶联的情况下,四丁基氮化铵(1当量)和4-氟苯乙烯(20 mol%)是成功偶联所必需的促进剂。