2-pyridyl, 2-picolyl, and 2-pyridylethyl substituents have been synthesized and employed as precursors for the preparation of novel water-soluble Au(I)- and Au(III)-NHC complexes of general composition [AuCl(NHC)] and [AuCl3(NHC)] (NHC = N-heterocyclic carbene), respectively. These complexes proved to be active, selective, and recyclable catalysts for the intramolecular cyclization of γ-alkynoic acids under
合成了带有3-磺酰基丙基,2-
吡啶基,2-
吡啶基和2-
吡啶基乙基取代基的两性离子
咪唑鎓盐,并将其用作制备新型
水溶性Au(I)-和Au(III)-NHC配合物的前体组成[AuCl(NHC)]和[AuCl 3(NHC)](NHC = N-杂环卡宾)。这些络合物被证明是在双相
甲苯/
水条件下用于γ-链烷酸分子内环化的活性,选择性和可回收催化剂,从而在温和条件下(rt)以高收率得到所需的烯醇内酯。值得注意的是,尽管众所周知
金络合物具有促进C≡C键
水合的能力,但即使在1,6-二炔的环异构化反应过程中也未观察到竞争
水合过程。