Palladium-Catalyzed Decarboxylative Arylation of Potassium Cyanoacetate: Synthesis of α-Diaryl Nitriles from Aryl Halides
作者:Pui Yee Yeung、Kin Ho Chung、Fuk Yee Kwong
DOI:10.1021/ol2009522
日期:2011.6.3
A palladium-catalyzeddecarboxylativecoupling of potassium cyanoacetate with aryl bromides and chlorides is described. The reaction conditions feature the absence of additional strong inorganic bases and provide ester functional group tolerance. With Pd(dba)2 and XPhos ligand as the catalyst system, α-diaryl nitriles can be obtained in good yields.
Two molar amounts of arynes were found to couple with nitriles via carbonâcarbon Ï-bond cleavage, assembling diverse diarylmethane skeletons in a straightforward manner.
Palladium-Catalyzed Direct α-Arylation of Arylacetonitriles with Aryl Tosylates and Mesylates
作者:On Ying Yuen、Xiangmeng Chen、Junyu Wu、Chau Ming So
DOI:10.1002/ejoc.202000176
日期:2020.3.31
The first general palladium‐catalyzed α‐arylation of arylacetonitriles with aryl and heteroaryl sulfonates are reported. The catalyst system comprising of Pd(OAc)2 and XPhos is highly effective towards this reaction. A wide range of aryl/heteroaryl tosylates and mesylates are coupled with arylacetonitriles smoothly and catalyst loadings as low as 0.1 mol‐% Pd can be achieved.
Switchable Stereoselectivity in Bromoaminocyclization of Olefins: Using Brønsted Acids of Anionic Chiral Cobalt(III) Complexes
作者:Hua-Jie Jiang、Kun Liu、Jie Yu、Ling Zhang、Liu-Zhu Gong
DOI:10.1002/anie.201705066
日期:2017.9.18
Brønsted acids of anionic chiral CoIII complexes act as bifunctional phase‐transfer catalysts to shuttle the substrates across the solvent interface and control stereoselectivity. The diastereomeric chiral CoIII‐templated Brønsted acids, with the same chiral ligands, enabled a switch in the enantioselective bromoaminocyclization of olefins to afford the two enantiomers of 2‐substituted pyrrolidines