The synthesis of benzo[g]chromene derivatives through a multi-component reaction catalyzed by lipase was reported in the first time. This novel efficient method has the advantages of environmental friendliness, high yield and simple work-up.

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The hardness of oxoions (O 2À )means that coinagemetal (Cu, Ag, Au) clusters supported by oxoi ons (O 2À )a re rare.H erein, an ovel m 4 -oxo supported all-alkynyl-protected silver(I)-copper(I) nanocluster [Ag 74Àx Cu x O 12 (PhC C) 50 ] (NC-1,a vg.x = 37.9) is characterized. NC-1 is the highest nuclearity silver-copper heterometallic cluster and contains an unprecedented twelve interstitial m 4 -oxo ions.T he oxoi ons originate from the reduction of nitrate ions by NaBH 4 .The oxo ions induce the hierarchical aggregation of Cu I and Ag I ions in the cluster,f orming the unique regioselective distribution of two different metal ions.T he anisotropic ligand coverage on the surface is caused by the jigsaw-puzzle-like cluster packing incorporating rare intermolecular C À H···metal agostic interactions and solvent molecules.T his work not only reveals an ew category of high-nuclearity coinage-metal clusters but shows the special clustering effect of oxo ions in the assembly of coinage-metal clusters.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

In this work, a lipase–glucose oxidase system has been designed and proven to be an efficient system for the oxidation of N-heteroaromatic compounds and tertiary amines.

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