Nickel-Copper-Catalyzed C(<i>sp</i><sup>2</sup>)N Cross-Coupling of Cyclic and Bridged Amides: An Access to Cyclic Enamides and Alkenyl Vince Lactams
作者:Pintu Maity、Debasish Kundu、Brindaban C. Ranu
DOI:10.1002/adsc.201500457
日期:2015.11.16
of E2 type elimination of (Z)-styrenyl halides in the presence of a strong base like cesium carbonate followed by homocoupling. This catalyst system works efficiently for the N-arylation too along with N-styrenylation and vinylation. The bridged as well as cyclic amides successfully coupled with substituted aryl halides to provide the corresponding products. In general, the reactions are clean and high
在没有任何配体的情况下,已开发出苯乙烯和卤化乙烯基与环和桥联酰胺的高效C(sp 2)N交叉偶联,乙酰丙酮丙酮化镍[Ni(acac)2 ]和碘化铜(I)催化。优化反应条件,以使碳酸铯(Cs 2 CO 3)(2.0当量)在N-甲基-2-吡咯烷酮(NMP)中,在氩气中,在Ni(acac)存在下,在110°C的条件下获得最大的产物收率。)2/ CuI(各10 mol%)。通过该程序获得了一系列文斯内酰胺(桥联酰胺)和环状酰胺的烯基衍生物。含卤素的苯乙烯基溴化物也要与酰胺偶合以提供产物。偶联具有高度的化学选择性,因为在反应过程中,芳环上的卤素(Br,Cl,F)保持完整,可用于进一步官能化以使这些酰胺更有用。尽管(E)-苯乙烯基卤化物产生了相应的(E)-苯乙烯基烯酰胺,但与(Z)-苯乙烯基卤化物的反应产生了1,3-二炔,而不是(Z)-苯乙烯基酰胺。可以通过消除E 2型消除(Z苯乙烯-卤化物在强碱(如碳