Rhodium N-Heterocyclic Carbene Complexes as Effective Catalysts for [2+2+2]-Cycloaddition Reactions
作者:Anna Roglans、Iván González、Anna Pla-Quintana
DOI:10.1055/s-0029-1217982
日期:2009.10
Rhodium complexes of N-heterocyclic carbenes (NHC) [RhCl(cod)(NHC)], [cod = 1,5-cyclooctadiene, NHC = 1,3-diisopropylimidazolin-2-ylidene, and NHC = 1,3-dimesitylimidazolin-2-ylidene] are tested for intra- and partially intramolecular [2+2+2]-cycloaddition reactions demonstrating their effectiveness in this kind of process. This is the first use of a rhodium-NHC complex in a [2+2+2]-cycloaddition reaction of three alkynes. ESI-MS has been used to detect oxidative addition intermediates using rhodium NHC as the catalytic system.
在分子内和部分分子内 [2+2+2]-cycloaddition 反应中测试了 N-heterocyclic carbenes (NHC) [RhCl(cod)(NHC)], [cod = 1,5-cyclooctadiene, NHC = 1,3-disopropylimidazolin-2-ylidene, and NHC = 1,3-dimesitylimidazolin-2-ylidene] 的铑络合物,证明了它们在此类反应中的有效性。这是首次将铑-NHC 复合物用于三种炔烃的[2+2+2]-环加成反应。ESI-MS 被用来检测以 NHC 铑为催化体系的氧化加成中间产物。