Nickel-catalyzed Heck reaction of cycloalkenes using aryl sulfonates and pivalates
作者:Jianrong Steve Zhou、Xiaolei Huang、Shenghan Teng、Yonggui Robin Chi
DOI:10.1039/d1cc00634g
日期:——
Nickel-catalyzed Heck reaction of cycloalkenes delivers unusual conjugated arylated isomers. Nickel(0) catalysts ligated by chelating dialkylphosphines effectively activate not only aryl triflates as electrophiles, but also less reactive aryl mesylates, tosylates and pivalates. The omission of bases allows nickel hydride species to exist long enough to perform in situ olefin isomerization of initial
Highly Selective Palladium-Catalyzed Heck Reactions of Aryl Bromides with Cycloalkenes
作者:Christian G. Hartung、Klaus Köhler、Matthias Beller
DOI:10.1021/ol9901063
日期:1999.9.1
[reaction: see text] The influence of palladium catalysts and reaction conditions on the selectivity of Heckreactions of arylbromides with cyclohexene and cyclopentene has been investigated. It is shown that the addition of DMSO as a cosolvent leads to improved selectivities of nonconjugated aryl olefins. On the other hand, high selectivities for conjugated arylcyclopentenes have been obtained with
[反应:见正文]研究了钯催化剂和反应条件对芳基溴化物与环己烯和环戊烯的Heck反应选择性的影响。结果表明,添加DMSO作为助溶剂可提高非共轭芳基烯烃的选择性。另一方面,通过催化体系DMA / Na2CO3 / Pd2(dba)3 x dba / PCy3获得了对共轭芳基环戊烯的高选择性。