جستجوی مقالات مرتبط با کلیدواژه « ایزوسیانید » در نشریات گروه « شیمی »

An efficient synthesis of 3-aminoimidazo[1,2-a]pyridines via three-component reaction from aromatic aldehydes, 2-aminopyridines and isonitriles at room temperature in water/2,2,2-trifluoroethanol two-phase systems is described. In this methodology equivalent or better yield was obtained in the two-phase systems when compared to pure 2,2,2-trifluoroethanol for reaction. The use of the two-phase system also reduces the consumption of CF3CH2OH by 75% leading to a significant reduction in cost as well as toxicity of the reaction media. The strong hydrogen bond donation properties can also eliminate the need for Lewis acid catalyst, further simplifying the procedure. High yield, short reaction time, simple work up without need to column chromatography and use of mild and environmental friendliness conditions are some of benefits of the present method in synthesis of this biologically compounds.

The present work investigates synthesis and characterization of two organoplatinum(II) complexes comprising various isocyanide ligands with general formula of [PtR'2(CNR)2] (R' = p-tolyl, R = 2-chloro-6-methylphenyl (1) and 2-naphtyl (2)). The resulting complexes were characterized by multinuclear (1H, 13C, 195Pt) NMR spectroscopy by assistance of two dimensional (HH COSY and HSQC) NMR technique. Besides, HH-NOESY (Nuclear Overhauser Effect Spectroscopy) technique was employed to provide more accurate 1HNMR assignments. In order to have a better structural vision for the complexes, the structures were optimized by DFT (Density Functional Theory) method in CH2Cl2 solution. The molecular docking studies were performed for complexes 1 and 2 while it revealed the specific binding site, binding mode and the best orientation of the complexes to DNA.

In this manuscript the reaction of 2-mercaptoquinoline-3-carbaldehydes and 1,1,3,3-tetramethyl butylisocyanide as highly substituted isocyanide in the reflux of ethanol without catalyst is described. Formation of C-S, C-C and simultaneously oxidation towards thiophenone derivative is the advantage of this reaction. Also contrary to our impression using hindered isocyanides did not prevent the cyclisation. Only in one example when 2-mercapto quinoline-3-carbaldehyde was used in the reaction, the corresponding alpha keto amide was formed. All of the compounds are new so that they were characterized by mp, FT-IR, H and C-NMR and in some case the structure was confirmed by x-ray single crystallography.

A three-component reaction between the derivatives of benzyl alcohol, 2-aminophenol, and isocyanide for preparation Benzo[b][1,4]oxazine-2-amine derivatives has been reported. In this reaction, benzaldehyde derivatives were obtained as in situ from benzyl alcohol under oxidation by in urea hydrogen peroxide and magnesium bromide catalyst. This reaction was preferred in High efficiency and easy separation products of the reaction conditions. 

Zwitterionic (dipolar) intermediates are unstable and very reactive species which areusually generated in situ in many organic reactions and trapped during the reaction by other reactants to afford the products. There are many ways to form different zwitterionic intermediates. One of the most common methods for their generation is addition of non-protic nucleophiles to the activated alkynes. Isocyanides are especially noticeable as nucleophiles in the sense that they formed Huisgen intermediate, as one of the known zwitterionic species. Numerous significant papers have been published over the last two decades with focal theme of trapping Huisgen intermediate formed by the reaction of isocyanides with activated alkynes. In this review, different aspects of these publications based on the role of various trapping agents and then mechanisms ofactions are discussed in detail.