starting from 2-(2-pyridyl) imidazole a series of substituted imidazoles (2-5) were prepared. from the reaction of 2-(3-pyridyl) -4-(or 5) nitroimidazole (15) with dimethyl sulfate in alkaline medium 1-methyl-2-(3- pyridy1)-4-nitroimidazole (6,)w as prepared. reaction of compound 15 with diazomethane gave i-methyl-2-(3-pyridy1)-5- nitroimidazol(e7 ) in addition to 6. the antibacterial and antif...

We investigated the effect of fifteen 1,5-disubstituted imidazoles (1,5-dis) on juvenile hormone III (JH III) and methyl farnesoate (MF) biosynthesis by the corpora allata (CA) of the mosquito Aedes aegypti in vitro. Four compounds (TH-35, TH-83, TH-62 and TH-28) significantly decreased JH biosynthesis in the CA dissected from 3-day old sugar-fed females. The decrease of JH synthesis was not al...

Tertiary propargyl vinyl ethers armed with an electron-withdrawing group (amide or ester) at the tertiary propargylic position have been efficiently transformed into trisubstituted C(2)-chain functionalized furans. The metal-free domino transformation involves a microwave-assisted tandem [3,3]-propargyl Claisen rearrangement/5-exo-dig O-cyclization reaction. The manifold can be performed in a o...

Abstract The construction of 7-membered ring via direct C7–H cyclization benzoimidazoles with alkenes would provide a more atom- and step-economical route to tricyclic imidazoles derivatives that widely exist in broad range bioactive molecules. However, transition metal-catalyzed C–H for medium-ring synthesis has been limited reactive bonds, instead, the activation unreactive bonds towards medi...

The synthesis of non-racemic 5-membered cyclic carbonates from abundant alcohols is reported. Conversion the alcohol into an azanyl carbonate followed by a chiral-at-ruthenium catalyzed cyclization to provide chiral in yields up 95% and with 99% ee. This new synthetic method proposed proceed through nitrene-mediated intramolecular C(sp 3 )−H oxygenation which includes very unusual 1,7-hydrogen ...

A general approach for the synthesis of bis(imidazolium) dichloride salts from imidazoles and dichloroalkanes is reported. Typical limitations this reaction formation methylene-bridge...

Starting from 2-(2-pyridyl) imidazole a series of substituted imidazoles (2-5) were prepared. From the reaction of 2-(3-pyridyl) -4-(or 5) nitroimidazole (15) with dimethyl sulfate in alkaline medium 1-methyl-2-(3- pyridy1)-4-nitroimidazole (6,)w as prepared. Reaction of compound 15 with diazomethane gave I-methyl-2-(3-pyridy1)-5- nitroimidazol(e7 ) in addition to 6. The antibacterial and an...

[figure: see text] The formation of the trisubstituted cycloalkene 7 by RCM of diene 5 proceeds via the acyclic dimer 6, thus demonstrating the ready reversibility of olefin metathesis if catalyzed by "second generation" ruthenium carbene complexes such as 2-4. When applied to acrylate 11, these catalysts trigger a cyclooligomerization process that evolves with time and serves as key step en ro...