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We describe herein a simple, fast and inexpensive protocol for the oxidative coupling of thiols employing a stoichiometric amount of DMSO and iodine as the catalyst. Various aromatic disulfides were obtained in good to excellent yields in short reaction times at room temperature, while aliphatic disulfides were achieved in good yields when the reactions were conducted under microwave irradiation. [ABSTRACT FROM AUTHOR]

Herein, we report the microwave-assisted synthesis of 1,3-diynes from terminal acetylenes, catalyzed by CuI and tetramethylethylenediamine, in the presence of air as the oxidant, at 100 °C for only 10 min under solvent-free conditions. This efficient methodology allowed the homocoupling of several terminal alkynes in moderate to excellent yields. Moreover, the same protocol was also applicable for the synthesis of some unsymmetrical 1,3-diynes through the cross-coupling reaction. [ABSTRACT FROM AUTHOR]

One-pot modular synthesis of β-chalcogen amides via regioselective 2-oxazolines ring-opening reaction promoted by indium chalcogenolates under microwave irradiation. • New synthetic methodology allows quick access to β-chalcogen amides. • Simpler and greener experimental protocol for the 2-oxazoline ring-opening reaction. • Reaction time reduced from 24 h to 20 min using microwave irradiation. • Modular synthesis, easily accessible starting materials, high value-added products. We describe herein a microwave-assisted synthesis of β-chalcogen amides through the regioselective ring-opening reaction of 2-oxazolines promoted by bis(organoylchalcogeno)iodo indium(III) in situ generated. This protocol allows the preparation of structurally diverse β-chalcogen amides, with moderate to good yields, within a much shorter reaction time compared to conventional heating protocols. [ABSTRACT FROM AUTHOR]

Herein, we describe a simple and efficient route to access aniline-derived diselenides and evaluate their antioxidant/GPx-mimetic properties. The diselenides were obtained in good yields via ipso-substitution/reduction from the readily available 2-nitroaromatic halides (Cl, Br, I). These diselenides present GPx-mimetic properties, showing better antioxidant activity than the standard GPx-mimetic compounds, ebselen and diphenyl diselenide. DFT analysis demonstrated that the electronic properties of the substituents determine the charge delocalization and the partial charge on selenium, which correlate with the catalytic performances. The amino group concurs in the stabilization of the selenolate intermediate through a hydrogen bond with the selenium. [ABSTRACT FROM AUTHOR]

• Benzothiazoles were efficiently prepared starting from disulfides and primary alcohols. • 2-Alkylbenzothiazoles were prepared from primary alcohols using DTBP as oxidant. • Bis(o -aminophenyl) disulfides were converted to 2-arylbenzothiazoles. • 2-Arylbenzothiazoles were prepared from benzylic alcohols in the presence of DTBP. A peroxide-mediated protocol for the synthesis of 2-substituted benzothiazoles was developed, starting from bis(o -aminophenyl) disulfides and primary alcohols. Eleven differently 2-substituted benzothiazoles were prepared in moderate to excellent yields using di- tert -butyl peroxide (DTBP) as an oxidant. [ABSTRACT FROM AUTHOR]

Abstract: Herein, we report a greener protocol for the synthesis of 3‐Se/S‐indoles and imidazo[1,2‐a]pyridines through direct C(sp2)−H bond chalcogenation of heteroarenes with half molar equivalents of different dichalcogenides, using KIO3 as a non‐toxic, easy‐to‐handle catalyst and a stoichiometric amount of glycerol. The reaction features are high yields, based on atom economy, easy performance on gram‐scale, metal‐ and solvent‐free conditions as well as applicability to different types of N‐heteroarenes. [ABSTRACT FROM AUTHOR]

Abstract: In this study CuO nanoparticles were applied as a catalyst for Cglyph name="sbnd" />Te, and Crmation. The reaction was performed with organoyl iodides and elemental selenium, tellurium or sulfur under microwave irradiation in the presence of a base and solvent at 80°C. This novel protocol allowed the synthesis of a variety of diselenides, ditellurides and disulfides in good to excellent yields in a very short reaction time. [Copyright &y& Elsevier]