A new and facile access to the 2-(indol-3-yl)-3-nitriloquinolines based on Friedländer annulations

Preparation of 2-(indol-3-yl)-3-nitriloquinolines via Friedländer quinoline synthesis using 3-cyanoacetylindoles possessing an α-methylene group and ortho-amino arylketones have been described. This reaction took place in PEG-400 as a green solvent and it is catalyzed with polyphosphoric acid (PPA) to give novel types of quinolines containing both indoles and cyano functions in one step under thermal and microwave conditions.     

Synthesis and characterization of sulfamic acid supported on Fe3O4 nanoparticles: A green,versatile and magnetically separable acidic catalyst for oxidation reactions and Knoevenagel condensation

Sulfamic acid immobilized on diethylenetriamine functionalized Fe₃O₄ nanoparticles (SA‐DETA‐Fe₃O₄) was successfully prepared and characterized by X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR), vibrating sample magnetometer (VSM), thermo gravimetric analysis (TGA), X‐Ray diffraction (XRD) and scanning electron microscopy (SEM). The sulfamic acid was found as a magnetically separable and highly active catalyst for the oxidative coupling thiols, oxidation of sulfides. Furthermore, the SA‐DETA‐Fe₃O₄ showed the high catalytic activity in Knoevenagel condensation of aromatic aldehydes with active methylene compounds (malononitrile and ethyl cynoacetate). The nanosolid catalyst could be easily recovered by a simple magnetic separation and reused for many cycles without deterioration in catalytic activity.     

Supported benzimidazole‐salen Cu(II) complex: An efficient,versatile and highly reusable nanocatalyst for one‐pot synthesis of hybrid molecules

A novel and efficient nanocatalyst consisting of benzimidazole‐salen Cu(II) complex on surface‐modified silica (BS‐Cu(II)@SiO₂) was prepared. The heterogeneous nanocatalyst was characterized by FESEM, TEM, EDX, FT‐IR, XRD, ICP, and TGA. The nanocatalyst was used for the one‐pot synthesis of some target hybrid molecules. An efficient four component C–H bond activation/[3 + 2] cycloaddition and condensation/cyclization/aromatization sequence toward triazole‐benzimidazole derivatives is disclosed. This methodology provides a general and rapid synthetic route to some new triazole‐benzimidazole hybrids under mild reaction conditions. In addition, the heterogeneous nanocatalyst can be easily separated from the reaction mixture and used several times without noticeable leaching or loss of its catalytic activity. We believe this interesting one‐pot reaction as well as benzimidazole‐salen Cu(II) complex pave the way to the design and synthesis of other new hybrid molecules and metal catalysts, respectively.     

Participation of ethyl 3-formylindole-2-carboxylate with the Ugi four-component condensation reaction

Multicomponent condensation of ethyl 3-formylindole 2-carboxylate, amines, isocyanide and (S)-N-boc-alanine or (S)-N-boc-serine is described. This Ugi four-component condensation (Ugi-4CC) reaction yielded a series of novel dipeptides containing an indolyl moiety. These compounds exhibit potential biological activity.     

Investigation on effects of operating conditions in combined activation of char to develop the pore structure

In this study, activation of pistachio shell char was investigated by chemical, physical and combined activation experimentally using a TGA instrument and lab scale reactor. The effects of operating conditions such as activation time, temperature and impregnation ratio in the activation methods were studied via the weight loss and iodine number of the samples. The results showed that combined activation is the premium activation method. In addition, in this method. a temperature of 800 °C, a dwell time of 45 min and an impregnation ratio of 50 % are the optimum conditions which give a product with an iodine number of 2433 mg/g and a weight loss 52 %. A high iodine number of this activated carbon was developed at a moderate temperature and dwell time, and the weight loss confirms the advantages of the combined activation method. The products were characterized by SEM and FTIR analyses.     

AN EFFICIENT PRO CEDURE FOR THE PREPARATION OF MONO,AND DI-BIS-INDOLYL METHANES CATALYZED BY MOLIBDATOPHOSPHORIC ACID

H ₃ PMo ₁₂ O ₄₀ · xH ₂ O was found to be an effective catalyst for the preparation of bis-indolyl derivatives from indole and aromatic, aliphatic, heterocyclic aldehydes or ketones in ethanol at room temperature.     

A novel method for the reduction of sulfoxides with the N,N,N’,N’-tetrabromobenzene-1,3-disulfonamide (TBBDA)/PPh3 system

A new method is described for the reduction of sulfoxides to sulfides using N,N,N’,N’-tetrabromobenzene-1,3-disulfonamide [TBBDA] in combination with triphenylphosphine. Good to excellent yields, short reaction times, high efficiency and facile isolation of the desired products are the advantages of this method.     

Analysis of trans-Resveratrol in Iranian Grape Cultivars by LC

In this study, trans-resveratrol levels were determined in 147 Iranian grape cultivars using a modified extraction and gradient HPLC procedure with photodiode array detection. It was found that 41 out of 147 cultivars contained significant levels of trans-resveratrol. The detected amounts ranged from 0.98 to 6.25 mg kg^?1 fresh weight with a mean value of 3.59 (white grapes) and 3.08 mg kg^?1 (red grapes), respectively.     

Synthesis,Characterization, and Docking Evaluations of New Derivatives of Pyrimido[4,5‐c]pyridazine as Potential Human AKT1 Inhibitors

A number of new derivatives of pyrimido[4,5‐c]pyridazine have been synthesized from the treatment of 6‐acetyl‐3‐amino‐2,5‐diphenyl‐2,5‐dihydropyridazine‐4‐carbonitrile ( 1 ) as precursor with various reactants obtained quantitatively the desired products ( 2 ), ( 5 ), ( 7 ), and ( 9a , 9b , 9c , 9d , 9e ). The structures of all the synthesized products have been elucidated thoroughly. The potential AKT1 inhibitory activities of these new synthesized compounds have also been studied by docking calculations, which have been performed in Gold 5.2 software using Genetic algorithm.