preparation of porous coordinationpolymers (PCPs) with active silver sites and efficient silver–silver bond formation by carefully modifying the coordination geometries of the silver sites. The decentralized silver(I) chains in the porous frameworks enable the efficient conversion of CO2 and derivatives of acetylene to α-alkylidene cyclic carbonates in a heterogeneous manner. X-ray structure analysis reveals
The First Well-Defined Silver(I)-Complex-Catalyzed Cycloaddition of Azides onto Terminal Alkynes at Room Temperature
作者:James McNulty、Kunal Keskar、Ramesh Vemula
DOI:10.1002/chem.201103244
日期:2011.12.23
Silver(I)‐catalyzed click chemistry: Substituted 1,2,3‐triazoles are versatile intermediates with an expanding array of applications. The discovery and application of a general AgI‐catalyzed azide–alkyne cycloaddition reaction (AAC) leading to 1,2,3‐triazoles is reported. The synthesis of a stable, well‐defined AgI complex of type [AgI(L2)(OAc)] is described, along with the unprecedented ability of
4[gamma-H2SiW10O36Cu2(mu-1,1-N3)2] (I, TBA = tetra- n-butylammonium) could act as an efficient precatalyst for the regioselective 1,3-dipolarcycloaddition of organic azides to alkynes. Various combinations of substrates (four azides and eight alkynes) were efficiently converted to the corresponding 1,2,3-triazole derivatives in excellent yields without any additives. The present system was applicable to a larger-scale
The dicopper-substituted γ-Keggin silicotungstate with bis-μ-1,1-azido ligands TBA4H2[γ-SiW10O36Cu2(μ-1,1-N3)2] (TBA = tetrabutylammonium) could act as an effective homogeneous precatalyst for the ...