二茂铁基功能化的氮杂环卡宾银配合物的合成及催化活性

Synthesis and Catalytic Activity of Ferrocenyl-substituted N-Heterocyclic Carbene Silver Complexes

通过N-二茂铁基甲基-N-吡啶基甲基咪唑盐与氧化银在相转移催化条件下反应,合成了4个二茂铁基功能化的氮杂环卡宾银配合物(NHC)2AgX(X=PF6或BF4),并利用NMR及X-射线单晶衍射对其结构进行了表征.在这4个化合物中,银为二配位结构,吡啶氮原子并未参与配位.催化活性测试结果表明,合成的4个化合物具有高的催化炔、醛和胺三组分偶联反应活性.

Ferrocenyl-substituted N-heterocyclic carbene( NHC) transition metal complexes have received considerable attention in recent years due to their extensive applications in homogenous catalysis or electrochemical investigation. In this work,four NHC-silver complexes(NHC)2AgX(X = PF6or BF4) were synthesized by the reactions of N-ferrocenylmethyl-N'-( pyridylmethyl) imidazolium salts with Ag2O under the phase transfer catalytic conditions,and were characterized by elemental analysis,NMR and single-crystal X-ray crystallographic analysis. The silver atom in four complexes showed a two-coordinated linear structure. The pyridyl nitrogen atom didn't take part in the coordination to the silver center. Those complexes exhibited highly effective catalytic activity in the three-component coupling reaction of aldehyde,alkyne and amine.