A Versatile Approach to Ullmann C–N Couplings at Room Temperature: New Families of Nucleophiles and Electrophiles for Photoinduced, Copper-Catalyzed Processes
作者:Daniel T. Ziegler、Junwon Choi、José María Muñoz-Molina、Alex C. Bissember、Jonas C. Peters、Gregory C. Fu
DOI:10.1021/ja4060806
日期:2013.9.4
The use of light to facilitate copper-catalyzed cross-couplings of nitrogen nucleophiles can enable C-N bond formation to occur under unusually mild conditions. In this study, we substantially expand the scope of such processes, establishing that this approach is not limited to reactions of carbazoles with iodobenzene and alkyl halides. Specifically, we demonstrate for the first time that other nitrogen
The synthesis of enynes from the coupling of terminal alkynes with alkenyl iodides and bromides is described. This system employs 1.0-5.0 mol% of CuI(Xantphos) as a catalyst. A variety of alkenyl iodides and bromides are coupled smoothly with terminal alkynes, affording enynes in good to excellent yields.
Microwave-Assisted Copper-Catalyzed Cross-Coupling Reaction of Alkynes with Aryl Iodides and Vinyl Halides
作者:Chin-Fa Lee、Wen-Ting Tsai、Yun-Yung Lin、Yu-Jen Wang
DOI:10.1055/s-0031-1290813
日期:2012.5
copper-catalyzed coupling of terminalalkynes with aryl iodides and vinyl halides is reported. In general, the reactions are completed in 10–30 min using 2–5 mol% [CuI(xantphos)] as a catalyst to provide the corresponding alkynes and enynes in good to excellent yields. A broad spectrum of aryl iodides, vinyl iodides, and bromides are coupled with aryl- and alkyl alkynes. The microwave-assisted, copper-catalyzed
A copper-catalyzed cross-coupling reaction of alkynes with aryl iodides is described. The system tolerates a broad range of functional groups and enables the sterically demanding substrates presented during the catalysis with only 5–10 mol% of Cu2O as the catalyst.
Addition of Mixed (Alkenyl)dialkylzincates to Vicinal Diketo Esters
作者:Lars Selter、Klaus Harms、Ulrich Koert
DOI:10.1002/ejoc.201601598
日期:2017.2.24
Methods for the regioselective alkylation, arylation and alkenylation of α,β-diketoesters using organozinc reagents are reported. Alkylation and arylation in α-position is possible using diorgano zinc compounds. Alkenylation can be achieved using mixed alkenyl-dineopentyl zincates.