N-Directing Group Assisted Rhodium-Catalyzed Aryl C–H Addition to Aryl Aldehydes
摘要:
Direct aryl C-H addition to aryl aldehydes to produce biaryl methanols was reported via Rh catalysis with an N-containing directing group. The method is highly atom-, step-, and redox-economic. The procedure is robust, reliable, and compatible with water and air.
Aromatic C-H Addition to Ketones: The Effect of Directing Groups
作者:Xi-Sha Zhang、Qi-Lei Zhu、Fei-Xian Luo、Guihua Chen、Xin Wang、Zhang-Jie Shi
DOI:10.1002/ejoc.201301115
日期:2013.10
The first example of the transition-metal-catalyzed direct intermolecular C–H bond addition to ketones was achieved by using a rhodium catalyst. A significant influence of the directing group on the reactivity was observed, and sterically more hindered directing groups could promote the reaction. In addition, intermolecular hydrogen bonding played a role in stabilizing the product. The substrate scope
New Cobalt-Catalyzed Cross-Coupling Reactions of Heterocyclic Chlorides with Aryl and Heteroaryl Magnesium Halides
作者:Paul Knochel、Tobias J. Korn、Gérard Cahiez
DOI:10.1055/s-2003-41460
日期:——
New cobalt-catalyzed cross-coupling between arylmagnesium halides and 2-chloropyridines and related heterocycles occur at low temperature leading to 2-arylated heterocycles in good yields.
<i>N</i>-Directing Group Assisted Rhodium-Catalyzed Aryl C–H Addition to Aryl Aldehydes
作者:Yang Li、Xi-Sha Zhang、Kang Chen、Ke-Han He、Fei Pan、Bi-Jie Li、Zhang-Jie Shi
DOI:10.1021/ol2032784
日期:2012.1.20
Direct aryl C-H addition to aryl aldehydes to produce biaryl methanols was reported via Rh catalysis with an N-containing directing group. The method is highly atom-, step-, and redox-economic. The procedure is robust, reliable, and compatible with water and air.
Cobalt-Catalyzed Cross-Coupling Reactions of Heterocyclic Chlorides with Arylmagnesium Halides and of Polyfunctionalized Arylcopper Reagents with Aryl Bromides, Chlorides, Fluorides and Tosylates
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.