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An efficient one-pot synthesis process for preparing 2-imidazolines from aldehydes and ethylenediamine using molecular iodine and potassium carbonate in absolute ethanol at 25-30°C under ultrasound irradiation is described. The synthetic strategy has the following advantages: mild conditions and low costs requirements, readily available catalyst, short reaction times, simplicity of operation, and good-to-excellent yields. [ABSTRACT FROM AUTHOR]

Abstract: 2-Substituted benzothiazoles have been synthesized via one-pot reaction from aromatic aldehydes and o-aminothiophenol in the presence of FeCl3/Montmorillonite K-10 in absolute methanol at 25–30°C under ultrasound irradiation. The remarkable advantages are an inexpensive and easily available reagent, a simple procedure, mild conditions, short reaction times and moderate to good yields. [Copyright &y& Elsevier]

This account summarizes our efforts on the design, synthesis, and application of two classes of chiral diene ligands bearing bicyclo[3.3.0]octadiene or dicyclopentadiene skeletons. These chiral diene ligands can be readily prepared from inexpensive commercial materials with enzymatic resolution as the key synthetic step. The ligands have been successfully applied in some rhodiumcatalyzed reactions, including 1,4-addition to a,b-unsaturated carbonyl compounds, arylation of imines, and conjugate addition to nitroalkenes. In addition, they have been used in the first successful palladium-diene-catalyzed asymmetric reaction. [ABSTRACT FROM AUTHOR]

A simple, environmentally friendly procedure for the synthesis of 2-substituted benzimidazoles by the one-pot condensation of o-phenylenediamines with aromatic aldehydes using continuous bubbling of air in absolute ethanol at room temperature is described. The simplicity of the system, mild conditions, involvement of a non-toxic and practically inexhaustible oxidant, easy and quick isolation of the products, and moderate to good yields are the main advantages of this procedure. A simple, environmentally friendly procedure for the synthesis of 2-substituted benzimidazoles by the one-pot condensation of o-phenylenediamines with aromatic aldehydes using continuous bubbling of air in absolute ethanol at room temperature is described. [ABSTRACT FROM AUTHOR]

Highlights: [•] A H2O2/NaI/(NH4)6Mo7O24 system was first reported for synthesis of 2-benzimidazole. [•] Ultrasound was demonstrated to be benefit for accelerating this reaction. [•] The amounts of oxidant and catalyst are markedly reduced while keeping good yields. [•] The reaction was performed efficiently in green conditions with high yields. [Copyright &y& Elsevier]

The title compounds (IV) are obtained by convenient and efficient one-pot condensation of 1,3-dione (I) with various aromatic aldehydes (II) and thiourea (III) under mild reaction conditions. [ABSTRACT FROM AUTHOR]