A new library of arsine, stibine-stabilized N-heterocyclic carbene palladium complexes: synthesis, structures and activities in C–C and C–N coupling reactions
作者:Jin Yang、Pinhua Li、Yicheng Zhang、Lei Wang
DOI:10.1039/c4dt01773k
日期:——
A series of new N-heterocyclic carbene palladium complexes bearing AsPh3 and SbPh3 functions PdCl2(IMes)(AsPh3) (1a), PdCl2(IMes)(SbPh3) (1b), PdCl2(IPr)(AsPh3) (1c), PdCl2(IPr)(SbPh3) (1d), PdCl2(SIMes)(AsPh3) (2a), PdCl2(SIMes)(SbPh3) (2b), PdCl2(SIPr)(AsPh3) (2c), and PdCl2(SIPr)(SbPh3) (2d) (IMes = N,Nâ²-bis-(2,4,6-trimethylphenyl)imidazol-2-ylidene; IPr = N,Nâ²-bis-(2,6-di(iso-propyl)phenyl)imidazol-2-ylidene; SIMes = N,Nâ²-bis-(2,4,6-trimethylphenyl)imidazolidin-2-ylidene; SIPr = N,Nâ²-bis-(2,6-di(iso-propyl)phenyl)imidazolidin-2-ylidene) was synthesized and fully characterized by 1H NMR, 13C NMR, and FT-IR spectroscopy, elemental analysis and single-crystal X-ray crystallography. The catalytic potential of these arsine and stibine-stabilized carbene palladium complexes for Pd-mediated transformations was investigated with various substrates in the Hiyama cross-coupling reactions and BuchwaldâHartwig aminations. The results demonstrate that these complexes show high catalytic activity and good tolerance to various chemical functions.
一系列新型N-杂环卡宾钯配合物,带有AsPh3和SbPh3功能,包括PdCl2(IMes)(AsPh3) (1a)、PdCl2(IMes)(SbPh3) (1b)、PdCl2(IPr)(AsPh3) (1c)、PdCl2(IPr)(SbPh3) (1d)、PdCl2(SIMes)(AsPh3) (2a)、PdCl2(SIMes)(SbPh3) (2b)、PdCl2(SIPr)(AsPh3) (2c)和PdCl2(SIPr)(SbPh3) (2d)(IMes = N,N′-双(2,4,6-三甲基苯基)咪唑-2-亚基;IPr = N,N′-双(2,6-二异丙基苯基)咪唑-2-亚基;SIMes = N,N′-双(2,4,6-三甲基苯基)咪唑啉-2-亚基;SIPr = N,N′-双(2,6-二异丙基苯基)咪唑啉-2-亚基)被合成并通过1H NMR、13C NMR和FT-IR光谱、元素分析以及单晶X射线晶体学进行了全面表征。研究了这些砷和锑稳定的卡宾钯配合物在Hiyama交叉偶联反应和Buchwald-Hartwig胺化反应中对钯介导转化的催化潜力。结果表明,这些配合物显示出高催化活性和对各种化学功能良好的耐受性。