Chiral N-Heterocyclic Carbene Gold Complexes: Synthesis, Properties, and Application in Asymmetric Catalysis

Chiral N-Heterocyclic Carbene Gold Complexes: Synthesis, Properties, and Application in Asymmetric Catalysis
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DOI:
10.1021/om300917m
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发表时间:
2012-12-10
期刊:
影响因子:
2.8
通讯作者:
Kuendig, E. Peter
Kuendig, E. Peter
中科院分区:
化学2区
文献类型:
--
作者:
Banerjee, Dipshikha;Buzas, Andrea K.;Kuendig, E. Peter

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以本实验室合成的手性咪唑盐(1-9)为原料,合成了9个新的N-杂环卡宾氯化金配合物(10-18)。报道了所有配合物的全部表征,包括金(I)(1,3-双((S)-1-(2-甲氧基苯基)-2,2-二甲基丙基)-1H-咪唑-2(3 H)-亚基)氯化物(1,3)和金(I)(1,3-双((S)-2,2-二甲基-1-(萘-1-基)丙基)-1H-咪唑-2(3 H)-亚基)氯化物(16)的X射线结构。将配合物10-18应用于使用AgNTf 2作为添加剂的1,6-烯炔的甲氧基环化。通过用AgNTf 2处理配合物12来实现N-杂环卡宾金三氟亚胺酸盐(19)的合成。合成了一种新的金(I)(1,3-双((R)-1-(2-甲氧基苯基)-2,2-二甲基丙基)咪唑烷-2-亚基)(1,1,1-三氟-N-(三氟甲基磺酰基)甲基磺酰胺基)(19)配合物。
Nine new N-heterocyclic carbene gold chloride complexes (10-18) were synthesized starting from bulky chiral imidazolium salts (1-9) developed in this laboratory. Full characterization of all complexes, including the X-ray structures of gold(I)(1,3-bis((S)-1-(2-methoxyphenyl)-2,2-dimethylpropyl)-1H-imidazol-2(3H)-ylidene) chloride (13) and gold(I)(1,3-bis((S)-2,2-dimethyl-1-(naphthalen-1-yl)propyl)-1H-imidazol-2(3H)-ylidene) chloride (16), is reported. The complexes 10-18 were applied in the methoxycyclization of 1,6-enynes using AgNTf2 as an additive. Synthesis of the N-heterocyclic carbene gold triflimidate (19) was achieved by treating complex 12 with AgNTf2. The complex gold(I)(1,3-bis((R)-1-(2-methoxyphenyl)-2,2-dimethylpropyl)imidazolidin-2-ylidene)(1,1,1-trifluoro-N-(trifluoromethylsulfonyl)methylsulfonamido) (19) was isolated and spectroscopically and structurally (X-ray) characterized.