Tehran, Iran

Payame Noor University

Tehran, Iran

Payame Noor University is a public university and one of the largest universities in Iran, with its headquarters based in Tehran, 31 provincial centers, 485 local study centers, other campuses all around the country, and one International Study Center located in the headquarters in Tehran. Established in 1988, is a legal body under the Ministry of Science, Research and Technology.PNU took its first intake at 5 study fields at 28 local study centers. Presently, the university has 3,500 academic members and 1,101,182 national and international students.Its name means "The message of Light" in Persian. Wikipedia.

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Eftekhari-Sis B.,Islamic Azad University at Maragheh | Zirak M.,Payame Noor University
Chemical Reviews | Year: 2017

α-Imino esters are useful precursors for the synthesis of a variety of types of natural and unnatural α-amino acid derivatives, with a wide range of biological activities. Due to the adjacent ester group, α-imino esters are more reactive relative to other types of imines and undergo different kinds of reactions, including organometallics addition, metal catalyzed vinylation and alkynylation, aza-Henry, aza-Morita-Baylis-Hillman, imino-ene, Mannich-type, and cycloaddition reactions, as well as hydrogenation and reduction. This review discusses the mechanism, scope, and applications of the reactions of α-imino esters and related compounds in organic synthesis, covering the literature from the last 12 years. © 2017 American Chemical Society.

Eftekhari-Sis B.,Islamic Azad University at Maragheh | Zirak M.,Payame Noor University
Chemical Reviews | Year: 2015

Most heterocycles exhibit biological activity, including antitumor, anti-HIV, antibiotic, antidepressant, antiinflammatory, antiviral, antidiabetic, antimalarial, antimicrobial, antibacterial, antifungal, herbicidal, fungicidal, and insecticidal activities. Additionally, they have important applications in organic synthesis as organocatalysts, synthetic intermediates, chiral auxiliaries, and metal ligands in asymmetric catalysis. Therefore, the development of new efficient methods to synthesize heterocycles is of considerable interest. Pyrazole and pyrazoline derivatives have received great attention because of their interesting biological activities, such as antibacterial, antiviral, antidiabetic, antitubercular, antitumor, anti-inflammatory, and antidepressant activities.

Eftekhari-Sis B.,Islamic Azad University at Maragheh | Zirak M.,Payame Noor University | Akbari A.,Islamic Azad University at Maragheh
Chemical Reviews | Year: 2013

Heterocycles are an extraordinarily important class of compounds, making up more than half of all known organic compounds. Heterocycles are present in a wide variety of drugs, most vitamins, many natural products, biomolecules, and biologically active compounds, including antitumor, antibiotic, anti-inflammatory, antidepressant, antimalarial, anti-HIV, antimicrobial, antibacterial, antifungal, antiviral, antidiabetic, herbicidal, fungicidal, and insecticidal agents. Phenylglyoxal (PG), the simplest AG, is a yellow liquid that polymerizes upon standing. Upon heating, the polymeric material cracks to give back the yellow aldehyde. PG is recrystallized in hot water to form a colorless crystalline hydrate. AGs possessing adjacent aldehyde and ketone functional groups with different reactivity show interesting chemical properties. Due to existence of an electron-withdrawing ketone group, the reactivity of the aldehyde of AG is greater than that of benzaldehyde, a simple aromatic aldehyde.

This paper describes the synthesis and characterization of novel type poly (4-chloromethyl styrene-graft-4-vinylpyridine)/TiO2 nanocomposite. Firstly, poly (4-chloromethyl styrene)/TiO2 nanocomposite was synthesized by in situ free radical polymerizing of 4-chloromethyl styrene monomers in the presence of 3-(trimethoxysilyl) propylmethacrylate (MPS) modified nano-TiO2. Thereafter, 1-hydroxy-2,2,6,6-tetramethyl-1- piperidinyloxy (TEMPO-OH) was synthesized by the reduction of 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO). This functional nitroxyl compound was covalently attached to the poly (4-chloromethyl styrene)/TiO2 with replacement of chlorine atoms in the poly (4-chloromethyl styrene) chains. The controlled graft copolymerization of 4-vinylpyridine was initiated by poly (4-chloromethyl styrene)/TiO2 nanocomposite carrying TEMPO groups as a macroinitiators. The coupling of TEMPO with poly (4-chloromethyl styrene)/TiO2 was verified using 1H nuclear magnetic resonance (NMR) spectroscopy. The obtained nanocomposites were studied using transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectra, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and the optical properties of the nanocomposites were studied using ultraviolet-visible (UV-Vis) spectroscopy. © 2011 Elsevier Ltd. All rights reserved.

Veisi H.,Payame Noor University
Current Organic Chemistry | Year: 2011

In this review, the use of molecular iodine as a catalyst in the synthesis of heterocyclic compounds is presented and reviewed. In recent years, the use of molecular iodine in organic chemistry has received considerable attention because the chemical (a) is inexpensive and readily available, (b) is less toxic than alternatives, (c) has an easy workup method, and (d) is a moisture-stable, mild Lewis acid. Many of the reactions using iodine are associated with mild conditions, greater stero- and regioselectivities, short reaction times, and simplicity in their operation. © 2011 Bentham Science Publishers Ltd.

Asgarani S.,Payame Noor University
Physica A: Statistical Mechanics and its Applications | Year: 2013

In this paper, by considering the first three Khinchin axioms (K1-K3) and neglecting the fourth (K4), a set of new three-parameter entropies will be introduced which are expressed in terms of a generalized incomplete Gamma function as Sd,c1,c2[p]∝∼iΓ(d+1,1-c 1lnpi,1-c2lnpi). Also, its asymptotic behavior will be found and it will be shown that, for some special values of parameters, some known entropies like Tsallis, Kaniadakis and Abe entropies are recovered. © 2012 Elsevier B.V. All rights reserved.

A variety of N-substituted pyrroles have been synthesized by reacting γ-diketones with amines, diamines or triamine in the presence of silica sulfuric acid (SSA) at room temperature under solvent-free conditions. The experiment protocol features simple operations, and the products are isolated in high to excellent yields (70-98%). © 2010 Elsevier Ltd. All rights reserved.

Rapid and efficient oxidation of 2-substituted imidazolines with sodium periodate is reported. The Mn(III)-salophen/NaIO 4 catalytic system efficiently converted 2-imidazolines to their corresponding imidazoles at room temperature in 2: 1, CH 3CN/H 2O mixture. © 2011 Elsevier B.V.

A new and efficient procedure for the one-pot conversion of various alcohols, aldehydes and primary amines into the corresponding nitriles in excellent yields was easily achieved by trichloroisocyanuric acid (TCCA) as an oxidant and reagent in aqueous ammonia. Also, various benzylic halides were smoothly and directly converted into the corresponding aromatic nitriles in high yields under the same conditions. © Georg Thieme Verlag Stuttgart New York.

Mohseni M.,Payame Noor University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2011

We show that the nonlinear massive gravity model of de Rham, Gabadadze, and Tolley admits exact plane gravitational wave solution whose waveform obeys the two-dimensional Helmholtz equation. The solution is valid for arbitrary values of the coefficients of the cubic and quartic terms. In the massless limit the solution reduces to the Aichelburg-Sexl metric in general relativity. © 2011 American Physical Society.

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