A One-Pot Procedure for the Regiocontrolled Synthesis of Allyltriazoles via the Pd−Cu Bimetallic Catalyzed Three-Component Coupling Reaction of Nonactivated Terminal Alkynes, Allyl Carbonate, and Trimethylsilyl Azide

Water-Soluble O-, S- and Se-Functionalized Cyclic Acetyl-triaza-phosphines. Synthesis, Characterization and Application in Catalytic Azide-alkyne Cycloaddition

The 3,7-diacetyl-1,3,7-triaza-5-phosphabicyclo[3.3.1]nonane (DAPTA) derivatives, viz. the already reported 3,7-diacetyl-1,3,7-triaza-5-phosphabicyclo[3.3.1]nonane 5-oxide (DAPTA=O, 1), the novel 3,7-diacetyl-1,3,7-triaza-5-phosphabicyclo[3.3.1]nonane-5-sulfide (DAPTA=S, 2), and 3,7-diacetyl-1,3,7-triaza-5-phosphabicyclo[3.3.1]nonane-5-selenide (DAPTA=Se, 3), have been synthesized under mild conditions. They are soluble in water and most common organic solvents and have been characterized using ¹H and ³¹P NMR spectroscopy and, for 2 and 3, also by single crystal X-ray diffraction. The effect of O, S, or Se at the phosphorus atom on the structural features of the compounds has been investigated, also through the analyses of Hirshfeld surfaces. The presence of 1–3 enhances the activity of copper for the catalytic azide-alkyne cycloaddition reaction in an aqueous medium. The combination of cheaply available copper (II) acetate and compound 1 has been used as a catalyst for the one-pot and 1,4-regioselective procedure to obtain 1,2,3-triazoles with high yields and according to ‘click rules’.

Hetero-bimetallic cooperative catalysis for the synthesis of heteroarenes

Review covering the synthesis of 5- and 6-membered as well as condensed heteroarenes, focussing on the combinations in cooperative catalytic systems in strategies used to achieve selectivity and also highlights the mode of action for the cooperative catalysis leading to the synthesis of commercially and biologically relevant heteroarenes.

Highly N2-selective allylation of NH-1,2,3-triazoles with allenamides mediated by N-iodosuccinimide

We report a new protocol to synthesize N²-allyl-substituted 1,2,3-triazoles via NIS mediated allylation of allenamides with NH-1,2,3-triazoles.

N2-selective alkylation of NH-1,2,3-triazoles with vinyl ethers via gold catalysis

A new method was developed to synthesize N²-alkyl-substituted 1,2,3-triazoles via gold catalyzed alkylation of vinyl ethers with mono- and unsubstituted NH-1,2,3-triazoles and benzotriazole. A hydrogen bond between the oxygen atom of the vinyl ethers, activated via the gold catalyst, and the NH-1,2,3-triazoles was supposed to be generated, which selectively gave the N²-alkylation products.

A new method was developed to synthesize N²-alkyl-substituted 1,2,3-triazoles via gold catalyzed alkylation of vinyl ethers with mono- and unsubstituted NH-1,2,3-triazoles and benzotriazole.

N-2-Selective gold-catalyzed alkylation of 1-sulfonyl-1,2,3-trizoles

An efficient new method was developed to synthesis N-2-alkyl-1,2,3-trizoles via gold catalyzed alkylation of 1-sulfonyl-1,2,3-trizoles with vinyl ethers.

Copper(i)-mediated carboamination of vinyl azides by aryldiazonium salts: synthesis of N2-substituted 1,2,3-triazoles

Copper(i)-mediated carboamination reaction of vinyl azides with sole aryldiazonium salt for N²-substituted 1,2,3-triazoles.

Copper immobilized ferromagnetic nanoparticle triazine dendrimer (FMNP@TD–Cu(ii))-catalyzed regioselective synthesis of 1,4-disubstituted 1,2,3-triazoles

The synthesis, characterisation and catalytic activity of FMNP@TD–Cu(ii) for the synthesis of 1,4-disubstituted 1,2,3-triazoles are reported.

Copper-mediated C(sp2)–H amination using TMSN3 as a nitrogen source: redox-neutral access to primary anilines

A Cu-mediated C–H amination for the preparation of primary anilines under redox neutral conditions is developed.

Well-defined diimine copper(I) complexes as catalysts in click azide-alkyne cycloaddition reactions

A series of 1,4-disubstituted 1,2,3-triazoles have been prepared in high yields while respecting the stringent Click criteria. In these reactions, highly stable pre-formed complexes bearing diimine ligands were used.

Synthesis of 1,4-disubstituted mono and bis-triazolocarbo-acyclonucleoside analogues of 9-(4-hydroxybutyl)guanine by Cu(I)-catalyzed click azide-alkyne cycloaddition

A series of novel mono-1,2,3-triazole and bis-1,2,3-triazole acyclonucleoside analogues of 9-(4-hydroxybutyl)guanine was prepared via copper(I)-catalyzed 1,3-dipolar cycloaddition of N-9 propargylpurine, N-1-propargylpyrimidines/as-triazine with the azido-pseudo-sugar 4-azidobutylacetate under solvent-free microwave conditions, followed by treatment with K(2)CO(3)/MeOH, or NH(3)/MeOH. All compounds studied in this work were screened for their antiviral activities [against human rhinovirus (HRV) and hepatitis C virus (HCV)] and antibacterial activities against a series of Gram positive and negative bacteria.

Highly N2-selective palladium-catalyzed arylation of 1,2,3-triazoles

Highly N 2-selective arylation of 4,5-unsubstituted and 4-substituted 1,2,3-triazoles was achieved for the first time by Pd/L1 catalyst system. A wide range of N 2-aryl-1,2,3-triazoles were prepared from aryl bromides, chlorides and triflates with excellent (95–99%) N 2-selectivity. DFT calculations suggest that formation of N 2-arylated 1,2,3-triazoles is favored kinetically.