Here we describe an efficient method for the synthesis of a PEGylated N-heterocyclic carbene(NHC)– gold(I) complex. This PEGylated NHC–gold(I) complex exhibited high reactivity and regio-selectivity in the cyclization of various alkynoic acids and cascade reaction of tryptamine and alkynoic acids in water. A systematic study of double cyclization of dialkynoic acids to construct spiro enol lactones was first reported. Importantly, this water-soluble catalyst could be recycled seven times while maintaining good catalytic activity.

PEGylated N-Heterocyclic Carbene-Gold(I) Complex: An Efficient Catalyst for Cyclization Reaction in Water

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