Palladium−Imidazolium Carbene Catalyzed Aryl, Vinyl, and Alkyl Suzuki−Miyaura Cross Coupling
摘要:
[GRAPHICS]N,N-Bis-(2,6-diisopropylphenyl)dihydroimidazolium chloride with palladium(li) acetate (2 mol %) was used as catalyst, without added base, to efficiently cross couple aryl, vinyl, and alkyl boronates and boronic acids with aryldiazonium tetrafluoroborate substrates. The reactions were performed at 0 degreesC or rt, giving product in 2 to 4 h with 80 to 90% yields for isolated materials. Diazonium ions, formed in situ, also cross couple under these conditions.
The First General Palladium Catalyst for the Suzuki−Miyaura and Carbonyl Enolate Coupling of Aryl Arenesulfonates
作者:Hanh Nho Nguyen、Xiaohua Huang、Stephen L. Buchwald
DOI:10.1021/ja036947t
日期:2003.10.1
for the palladium-catalyzed Suzuki-Miyaura and carbonyl enolate coupling of unactivated aryl arenesulfonates was developed utilizing XPhos, 1, and Pd(OAc)2. This is of significant interest because aryl tosylates and aryl benzenesulfonates are more easily handled and considerably less expensive than aryl triflates. This catalyst system effects the coupling of a variety of aryl, heteroaryl, and extremely
General and highly efficient fluorinated-N-heterocyclic carbene–based catalysts for the palladium-catalyzed Suzuki–Miyaura reaction
作者:Taoping Liu、Xiaoming Zhao、Qilong Shen、Long Lu
DOI:10.1016/j.tet.2012.05.068
日期:2012.8
acid with aryl halides and heteroarylhalides, but also efficient for coupling of other heteroarylhalides and heteroaryl boronic acids. Finally, the catalyst is highly effective for Suzuki–Miyaura reaction of aryl bromides and chlorides with 0.01–0.1 mol % loading if the temperature was raised at refluxed THF/H2O.
据报道,一种通用且高效的三氟甲基化-N-杂环卡宾(NHC)基催化剂可用于钯催化的Suzuki-Miyaura反应。在催化剂的存在下,未活化的芳基氯和三氟甲磺酸与芳基硼酸的反应在室温下发生,收率好至极好(63-98%)。此外,由Pd(OAc)2 /咪唑鎓盐6a的组合产生的催化剂不仅对于杂芳基硼酸与芳基卤化物和杂芳基卤化物的偶联有效,而且对其他杂芳基卤化物和杂芳基硼酸的偶联有效。最后,如果温度在回流的THF / H 2 O上升高,则该催化剂对于0.01-0.1 mol%负载量的芳基溴化物和氯化物的Suzuki-Miyaura反应非常有效。
Supporting ligand-assisted N -heterocyclic carbene palladium complexes: characterization, computation, and catalytic activity in Suzuki–Miyaura cross coupling between aryl and heteroaromatic chlorides and various boronic acids
作者:An Shen、Yu-Cai Hu、Ting-Ting Liu、Chen Ni、Yong Luo、Yu-Cai Cao
DOI:10.1016/j.tetlet.2016.03.086
日期:2016.5
imine–Pd–(N-heterocycliccarbene) complexes have been developed as efficientcatalysts for Pd-catalyzed Suzuki–Miyauracouplingreaction. Based on the performance of supporting ligands, correlation of structure and catalytic activity has been demonstrated via experimental and computational modeling. A broad reaction scope of aryl and heteroaromatic chlorides could proceed at extremely low catalyst loading
Aryl Fluoride Activation through Palladium–Magnesium Bimetallic Cooperation: A Mechanistic and Computational Study
作者:Chen Wu、Samuel P. McCollom、Zhipeng Zheng、Jiadi Zhang、Sheng-Chun Sha、Minyan Li、Patrick J. Walsh、Neil C. Tomson
DOI:10.1021/acscatal.0c01301
日期:2020.7.17
described a mechanistic study of a palladium-catalyzed cross-coupling of aryl Grignard reagents to fluoroarenes that proceeds via a low-energy heterobimetallic oxidative addition pathway. Traditional oxidative additions of aryl chlorides to Pd complexes are known to be orders of magnitude faster than with arylfluorides, and many palladium catalysts do not activatearylfluorides at all. The experimental
Gold Catalyzed Decarboxylative Cross-Coupling of Iodoarenes
作者:Ryan A. Daley、Aaron S. Morrenzin、Sharon R. Neufeldt、Joseph J. Topczewski
DOI:10.1021/jacs.0c06244
日期:2020.7.29
This report details a decarboxylativecross-coupling of (hetero)arylcarboxylates with iodoarenes in the presence of a gold cata-lyst (>25 examples, up to 96% yield). This reaction is site specific, which overcomes prior limitations associated with gold cat-alyzed oxidative coupling reactions. The reactivity of the (hetero)arylcarboxylate correlates qualitatively to the field effect pa-rameter (Fortho)