[reaction: see text] CuI-exchanged solids based on zeolite materials were investigated for the first time as catalysts in organic synthesis. The catalytic potential of these was evaluated Huisgen [3 + 2]-cycloaddition. Five zeolites examined and CuI-USY proved to be a novel efficient heterogeneous ligand-free catalyst this "click chemistry"-type transformation.

For the first time, copper(I)-exchanged zeolites were developed as catalysts in organic synthesis. These solid materials proved to be versatile and efficient heterogeneous, ligand-free catalytic systems for Huisgen [3+2] cycloaddition. cheap easy-to-prepare exhibited a wide scope compatibility with functional groups. They are very simple use, easy remove (by filtration), recyclable (up three times without loss of activity). Investigations deuterated alkynes that this Cu(I)-zeolite-catalyzed...

Within the green chemistry context, heterogeneous catalysis is more and applied to organic synthesis. The well known ‘click chemistry’ especially its flagship, copper-catalyzed azide–alkyne cycloaddition reaction (CuAAC), now catch up by such heterogenisation process copper ions or metals have been grafted deposited on into various solids, as (bio)polymers, charcoal, silica, zeolites, POM MOF.

Abstract Chalcogen bonding results from non‐covalent interactions occurring between electrodeficient chalcogen atoms and Lewis bases. Among the chalcogens, tellurium is strongest acid, but Te‐based compounds are scarcely used as organocatalysts. For first time, telluronium cations demonstrated impressive catalytic properties at low loadings in three benchmark reactions: Friedel–Crafts bromination of anisole, bromolactonization ω‐unsaturated carboxylic acids aza‐Diels–Alder Danishefsky's...

Abstract Cu I ‐modified zeolites, especially ‐USY, have proved to be very efficient catalysts in multicomponent reactions, allowing for a solvent‐free synthesis of propargylamines from aldehydes, amines, and terminal alkynes. With heterogeneous catalyst the absence solvent, this process is among greenest ever reported. A mechanism has been proposed three‐component reaction.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

Aurones are conveniently formed in a three-step procedure including goldI-catalyzed cyclization of 2-(1-hydroxyprop-2-ynyl)phenols as highly regio- and stereoselective key step. A wide diversity derivatives can be obtained starting from substituted salicylaldehydes. Synthesis natural 4,6,3',4'-tetramethoxyaurone structure revision two products (dalmaisione D 4'-chloroaurone) were achieved.

In the presence of alcohol Ag or Au salts complexes catalyze conversion alkynyloxiranes to substituted furans. Both catalysts are effective, and a large furan diversity can be obtained in high yield with one other catalyst. Mechanistic studies revealed that cascade pathway not sometimes reported direct intramolecular nucleophilic addition oxirane oxygen atom intermediate acetylene-metal pi-complex occurs. Under defined conditions, formation epoxide opening products has been identified....

Copper(I)-exchanged zeolites were used as heterogeneous ligand-free catalysts for [3+2] cycloaddition of azomethine ylides, which allows versatile, efficient, and highly regioselective synthesis pyrazolone derivatives. These cheap easy-to-prepare exhibit wide scope compatibility with functional groups. They are very simple to use, easy remove (by filtration), recyclable (up six times without loss activity).

The ability of triaryltelluronium salts to interact with N-halosuccinimides (NXS) through chalcogen bonding (ChB) in the solid state and solution is demonstrated herein. Cocrystals bearing two CF

[Structure: see formula]. As demonstrated by 1H, 13C, and 109Ag NMR, a pi-alkyne-Ag complex then an alkynyl silver are in situ formed from alkyne salt conditions related to those used for Ag-catalyzed alkynylation or Ag/Pd-catalyzed sp-sp2 cross-coupling reactions. This finding allows rationale of the mechanisms these

Abstract Cu I ‐modified zeolites, especially –USY, proved to be very efficient catalysts for the homocoupling of terminal alkynes. Such heterogeneous offer a simple (no added ligand) and convenient synthesis diynes, including carbohydrate derivatives. A strong influence zeolite pore size has been observed, high (quantitative) yields being obtained with zeolites having large internal cages. The role acidic sites in reaction pointed out. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim,...

Functionalized furans are conveniently formed by a new silver(I)-catalyzed reaction of alk-1-ynyl oxiranes in the presence p-toluenesulfonic acid and methanol. Evidence supported cascade mechanism.

Abstract Copper(I)‐modified zeolites, especially Cu I –USY, proved to be very efficient catalysts in multi‐component reactions of epoxides with sodium azide and terminal alkynes. Such allow highly regio‐ stereoselective syntheses ofhydroxymethylated triazoles. These heterogeneous, modified zeolites can easily recovered reused. Moreover, the cascade reaction was best performed water at room temperature, rendering all processes truly green. Detailed investigations revealed role ‐modified play...

Acyloxylated divinyl ketones are conveniently formed by a new gold(I)-catalyzed rearrangement of (3-acyloxyprop-1-ynyl)oxiranes.

A series of cationic gold(I/III) pyridine complexes the type [(L)Au(pyr)](PF6) and [(L)AuCl2(pyr)](PF6), where L = IPr, (1, 5); IMes (2, 6); ItBu, (3, 7); ICy (4, 8); PPh3, (9, 10), were synthesized characterized by NMR spectroscopy single-crystal X-ray diffraction. The stability new their catalytic activity in five well-established organic transformations assessed.