Sharif Digital Repository

Polysaccharide is important in terms of their environmental interest, scientists have been growing. According to the structural properties of this interesting class of natural polymers, in terms of having chemically active groups on the high density polymer housing provides the possibility That can perform chemical reactions with the new properties of these polymers to give. Starch polysaccharides in the project through a chemical reaction to the structure of a third type of bridge Amen to that using 1HNMR and 13CNMR predicted structure was approved. The modified polysaccharide has catalyst activity. This activity in knovenagel reaction for some aldhydes was used and results were... 

Nowadays, heterocyclic compounds have become extremely important in various industries, especially the pharmaceutical industry.In this project, an efficient and environmentally friendly path is presented to synthesize numerous rhodanine-oxindole derivatives in polyethylene Glycol in one pot-four components procedure. This pathway doesn't need harsh reaction conditions such as high temperature, long time, catalysts, complicated separation steps, toxic solvents, etc. all products have been made under green strategy with high yield.
 

In the first chapter, three efficient synthesis of novel polyheterocyclic indole and thiochromone-annulated thiopyranocoumarin derivatives are achieved via domino Knoevenagel hetero Diels–Alder reaction of O-acrylated and O-propargylated salicylaldehyde derivatives with indolin-2-thiones and 4-hydroxy dithiocoumarin. The domino Knoevenagel-hetero-Diels–Alder reactions are very efficient process that allows the formation of two or more rings at once, avoiding sequential chemical transformations. The products are formed in good-to-excellent yields with high regio- and stereoselectivity. The major advantage of this reaction is the ease of the work-up during which the products can be isolated... 

The domino-Knoevenagele hetero-Dielse Alder reaction is an efficient synthesis of complex compounds like natural products from simple substrates and highly diverse molecules. In the first chapter, synthesis of pyran, pyranopyran, pyrano-thiopyran heterocycles and [6,5] pyranopyrrole derivatives are achieved via domino Knoevenagele hetero-Dielse Alder reaction of O-acrylated and o- propargylated salicylaldehyde derivatives with thiooxindole and 4- hydroxyl dithiocoumarin. We discovered a new and efficient synthesis of a great variety of thiopyrano indole annulated benzo -δ-sultones via domino Knoevenagele hetero-Dielse Alder reaction of thiooxindole derivatives and (E)-2-formylphenyl... 

We have reported a new and efficient synthesis of a broad spectrum of heterotetracyclic thiopyranoindole via knovenagel hetero diels alder reaction.Fused pyrimidines have attracted considerable attention in synthetic organic chemistry because of their wide range of biological activities pharmaceutical and therapeutic properties, and antibacterial, antiviral, antitumor, and anti-inflammatory activities. We have reported a new efficient method for synthesis of pyrimidines fused to coumarine, uracile, cyclohexane and triamino pyrimidine structures. The major benefits of the current study are high yields, short reaction times, mild reaction conditions and available materials..We have also... 

In this work, a new catalyst based on gold nanoparticles immobilized on magnetic GO (graphene oxide) has been introduced. A new ligand based on pyridine has been used to the functionalization of GO to design robust heterogeneous catalyst for reduction in a short time using a low amount of the catalyst. The prepared catalyst was employed in the synthesis of aromatic amines using various types of nitroarnes in water. This catalyst is readily prepared from available starting materials and also is a reusable catalyst having very good stability to air and moisture. The proposed procedure applied here can conduct the reactions under milder reactions. Finally, due to total removal of the...