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Synthesis of novel polycyclic indole-annulated thiopyranocoumarin derivatives via domino Knoevenagel-hetero-Diels-Alder reaction in aqueous media
, Article Helvetica Chimica Acta ; Volume 93, Issue 5 , 2010 , Pages 964-973 ; 0018019X (ISSN) ; Kiamehr, M ; Taheri, S ; Mirjafary, Z ; Sharif University of Technology
2010
Abstract
An efficient synthesis of polycyclic indole derivatives is achieved via domino Knoevenagel - hetero-Diels - Alder reaction of O-acrylated salicylaldehyde derivatives with dihydroindole-2-thiones in H2O as solvent. The products are formed in good-to-excellent yields with high regio- and stereoselectivity
New entry to bridged pentacyclic indolyltetrahydroisoquinoline skeleton via tandem s-alkylation and intramolecular C-Alkylation
, Article Synlett ; Issue 1 , 2010 , Pages 123-127 ; 09365214 (ISSN) ; Taheri, S ; Mirjafary, Z ; Saeidian, H ; Sharif University of Technology
2010
Abstract
An efficient, single-step synthesis of hitherto unknown indole-annulated pentacyclic indolylhydroisoquinolines via tandem S-alkylation and intramolecular C-alkylation of indolin-2-thiones with N-alkylisoquinolinium salts is reported. This new approach provides a powerful entry into polycyclic structures containing nitrogen and sulfur related to alkaloids
Rapid and efficient one-pot synthesis of 1,4-dihydropyridine and polyhydroquinoline derivatives through the hantzsch four component condensation by zinc oxide
, Article Journal of the Iranian Chemical Society ; Volume 6, Issue 2 , 2009 , Pages 317-324 ; 1735207X (ISSN) ; Saeidian, H ; Mirjafary, Z ; Sadeghi, A ; Sharif University of Technology
2009
Abstract
A one-pot four-component reaction of aldehydes, ethyl acetoacetate/5,5-dimethyl-1,3-cyclohexanedione, ethyl acetoacetate and ammonium acetate in the presence of 10 mol% of ZnO as a heterogeneous catalyst for the synthesis of corresponding 1,4-dihydropyridine and polyhydroquinoline derivatives via the Hantzsch condensation is described. The present methodology offers several advantages such as simple procedure, excellent yields, and short reaction time
KF-Al2O3 promoted synthesis of fully substituted new indeno- and naphtho-fused thiophenes under solvent-free conditions by controlled microwave heating
, Article Letters in Organic Chemistry ; Volume 4, Issue 8 , 2007 , Pages 576-584 ; 15701786 (ISSN) ; Saeidian, H ; Mirjafary, Z ; Sadeghi, A ; Sharif University of Technology
2007
Abstract
KF-Al2O3 catalyzes the reaction of arylthioacetamides with α-bromo, ketones to give fully substituted new indeno- and naphtho- fused thiophenes with good yields under solvent-free conditions by controlled microwave heating. A mechanism is proposed for the reaction course. © 2007 Bentham Science Publishers Ltd
Solvent-free synthesis of 2-amino-3-aryl-5-substituted thiophenes as anti-inflammatory agents using KF-Al2O3 under microwave irradiation
, Article Synthetic Communications ; Volume 38, Issue 12 , 2008 , Pages 2043-2053 ; 00397911 (ISSN) ; Sadeghi, A ; Mirjafary, Z ; Matloubi Moghaddam, F ; Sharif University of Technology
2008
Abstract
The synthesis of 2-amino-3-aryl-5-substituted thiophenes as anti-inflammatory agents catalyzed by KF-Al2O3 under microwave irradiation is reported. Copyright © Taylor & Francis Group, LLC
A simple and efficient synthesis of new indeno- and naphtho-fused thiophenes using arylthioacetamides
, Article Journal of Sulfur Chemistry ; Volume 27, Issue 6 , 2006 , Pages 545-552 ; 17415993 (ISSN) ; Saeidian, H ; Mirjafary, Z ; Taheri, S ; Sharif University of Technology
2006
Abstract
New indeno- and naphtho-fused thiophenes were synthesized from reaction of 2-bromo-1-indanone and 2-bromo-1-tetralone with arylthioacetamides in good yields
The synthesis of dibenzazocines via tandem dinucleophilic addition of phenols to quinolinium salts
, Article Arkivoc ; Volume 2010, Issue 11 , Sep , 2010 , Pages 91-100 ; 1551-7012 (ISSN) ; Saeidian, H ; Kiamehr, M ; Mirjafary, Z ; Taheri, S ; Sharif University of Technology
Arkat
2010
Abstract
Dibenzazocines were prepared via tandem dinucleophilic addition of phenols to quinolinium salts in good yields. The procedure is efficient, simple and the substrates are easily available
A new and facile synthesis of thieno[2,3-b]indole derivatives via condensation of isocyanide and indolin-2-thiones
, Article Synlett ; Issue 7 , 2009 , Pages 1047-1050 ; 09365214 (ISSN) ; Saeidian, H ; Mirjafary, Z ; Taheri, S ; Kheirjou, S ; Sharif University of Technology
2009
Abstract
A new one-pot synthesis of thieno[2,3-b]indole ring systems is described. Condensation of cyclohexyl isocyanide with indolin-2-thiones yielded 3-cyclohexyaminomethylene-indolin-2-thiones, which upon reaction with α-halocarbonyl compounds produced the title compounds. © Georg Thieme Verlag Stuttgart
Diastereo- and enantioselective synthesis of α,β-disubstituted γ-nisalkoxycarbonyl sulfonates
, Article Synlett ; Issue 17 , 2009 , Pages 2872-2874 ; 09365214 (ISSN) ; Saeidian, H ; Mirjafary, Z ; Iffland, D ; Raabe, G ; Runsink, J ; Sharif University of Technology
2009
Abstract
The asymmetric synthesis of ,-disubstituted -bisalkoxycarbonyl sulfonates is reported. The synthesis is based on the Michael addition of a lithiated enantiopure sulfonate bearing a cheap chiral sugar auxiliary to Knoevenagel acceptors. The reaction proceeds with high asymmetric inductions (ds=69-96%) and good yields (62-79%). The absolute configuration was determined by X-ray crystal-structure analysis
A facile synthesis of bridged polycyclic naphthooxazocine skeletons: Eight-membered-ring constructions via tandem dinucleophilic addition of naphthalenols to quinolinium salts
, Article Helvetica Chimica Acta ; Volume 94, Issue 1 , 2011 , Pages 142-147 ; 0018019X (ISSN) ; Taheri, S ; Mirjafary, Z ; Saeidian, H ; Kiamehr, M ; Tafazzoli, M ; Sharif University of Technology
2011
Abstract
The efficient synthesis of bridged polycyclic naphthooxazocines 3 via addition of naphthalenols 1 as a bis-nucleophile to N-alkylquinolinium salts 2 is described (Scheme 1 and Table 2). This new approach provides a powerful entry into polycyclic structures containing bicyclic N,O-acetals related to bioactive compounds
Efficient and green synthesis of new polycyclic procyanidin derivatives via tandem dinucleophilic addition of indolin-2-thiones to flavylium salts
, Article Pure and Applied Chemistry ; Volume 83, Issue 3 , January , 2011 , Pages 709-713 ; 00334545 (ISSN) ; Foroushani, B. K ; Saeidian, H ; Nourian, S ; Mirjafary, Z ; Kiamehr, M ; Sharif University of Technology
2011
Abstract
The green synthesis of a new series of polycyclic procyanidin derivatives has been achieved in good yields by tandem dinucleophilic addition of indolin-2-thiones to flavylium salts. The procedure is efficient and simple, and the substrates are easily available
A new domino Knoevenagel-hetero-Diels-Alder reaction: An efficient catalyst-free synthesis of novel thiochromone-annulated thiopyranocoumarin derivatives in aqueous medium
, Article Tetrahedron ; Volume 66, Issue 45 , November , 2010 , Pages 8615-8622 ; 00404020 (ISSN) ; Kiamehr, M ; Khodabakhshi, M. R ; Mirjafary, Z ; Fathi, S ; Saeidian, H ; Sharif University of Technology
2010
Abstract
An efficient catalyst-free synthesis of novel pentacyclic thiochromone-annulated thiopyranocoumarin derivatives is achieved via domino Knoevenagel-hetero-Diels-Alder reaction of 4-hydroxy dithiocoumarin and O-acrylated salicylaldehyde derivatives in H2O as solvent. The products are formed in good yields with high regio- and stereo-selectivity
Convenient synthesis of chlorohydrins from epoxides using zinc oxide: Application to 5,6-epoxysitosterol
, Article Heteroatom Chemistry ; Volume 20, Issue 3 , 2009 , Pages 157-163 ; 10427163 (ISSN) ; Saeidian, H ; Mirjafary, Z ; Jebeli Javan, M ; Moridi Farimani, M ; Seirafi, M ; Sharif University of Technology
2009
Abstract
Efficient synthesis of protected and unprotected chlorohydrins has been achieved by ring opening of epoxides with acetyl/benzoyl chloride and TMSCl using a catalytic amount of ZnO as a reusable catalyst. The applicability of ZnO is further extended by performing the cleavage of the natural product 5,6-epoxysitosterol with acetyl chloride. © 2009 Wiley Periodicals, Inc
Organocopper-based magnetically recoverable and reusable nanocatalyst for efficient synthesis of novel 1,2,3-triazole-based sulfonamides in green medium
, Article Research on Chemical Intermediates ; Volume 44, Issue 1 , 2018 , Pages 601-612 ; 09226168 (ISSN) ; Sadighian, H ; Arabgari, M ; Mirjafary, Z ; Ayati, S. E ; Najafi, E ; Matloubi Moghaddam, F ; Sharif University of Technology
Springer Netherlands
2018
Abstract
Abstract: We report robust green synthesis of novel 1,2,3-triazole-based sulfonamides bearing different motifs such as fluorine under click conditions in presence of a copper-based magnetically recoverable and reusable heterogeneous nanocatalyst. The organocopper catalyst at 0.5 mol.% was highly recyclable (up to five times) when recovered using an external magnet without significant loss in catalytic activity. The mild reaction conditions and excellent yields (69–95 %) make this protocol an attractive method for efficient synthesis of the title compounds. The structure of product 3a was determined by Röntgen crystal structure analysis. Graphical Abstract: [Figure not available: see...
Thioamides, Quinolinium and Isoquinolinium Salts: Useful Synthons in the Synthesis of Heterocyclic Compounds and Asymmetric Synthesis of Sulfonic acid Derivatives
, Ph.D. Dissertation Sharif University of Technology ; Matloubi Moghaddam, Firouz (Supervisor)
Abstract
We have reported a new and efficient synthesis of a broad spectrum of heterotetracyclic benzoxazocines via unique tandem 1,3-dinucleophilic addition of different bifunctional nucleophiles to quinolinium and isoquinolinium salts. The reaction generally involves the initial addition of nucleophiles to quinolinium salts to form enamine intermediate which can be trapped by intramolecular O/S-alkylation of nucleophiles. This protocol is a very mild and simple method for construction of eight-membered ring in fused heterocycles in a one-step process. We have also developed an efficient asymmetric synthesis of α,β-disubstituted γ-bisalkoxycarbonyl and α, β- disubstituted γ- phosphono sulfonates via...
ZnO nanoparticles: An efficient nanocatalyst for the synthesis of β-acetamido ketones/esters via a multi-component reaction
, Article Catalysis Communications ; Volume 9, Issue 2 , 2008 , Pages 299-306 ; 15667367 (ISSN) ; Saeidian, H ; Sadeghi, A ; Matloubi Moghaddam, F ; Sharif University of Technology
2008
Abstract
A convenient one-pot multi-component reaction of aromatic aldehydes, enolizable ketones or β-keto esters and acetonitrile in the presence of acetyl chloride and 10 mol% ZnO nanoparticles for the synthesis of β-acetamido ketones/esters at room temperature is described. © 2007 Elsevier B.V. All rights reserved
Down from the pedestal: Revisiting the exploit of literature in EFL language classes
, Article International Journal of Applied Linguistics and English Literature ; Volume 4, Issue 2 , 2015 , Pages 158-168 ; 22003592 (ISSN) ; Lari, Z ; Mosalli, Z ; Sharif University of Technology
Australian International Academic Centre PTY LTD
2015
Abstract
According to Arthur (2006, p. 200), “Through the use of literature, a language learning experience might become at the same time a source of immediate pleasure and satisfaction for the student. This possibility makes literature an appealing teaching device for ESL teachers”. However, numerous factors may contribute to the teachers’ lack of interest in using literary texts as a teaching tool. This study was an attempt to investigate Iranian EFL teachers’ attitude toward using literature in language classes and their perception toward the probable reasons of some teachers’ lack of interest in doing so. Altogether forty-four language teachers (19 females and 25 males, with a mean age of 26)...
Inclusion of carbon nanotubes in a hydroxyapatite sol-gel matrix
, Article Ceramics International ; Volume 35, Issue 7 , 2009 , Pages 2987-2991 ; 02728842 (ISSN) ; Nemati, Z. A ; Sadeghian, Z ; Sharif University of Technology
2009
Abstract
In this study, the inclusion of multi-walled carbon nanotubes as the second phase in the hydroxyapatite matrix, in order to improve the mechanical strength, has been performed via the sol-gel process. The stability of carbon nanotube sol with the changes of pH and dispersant values (sodium dodecyl sulfate) was evaluated by zeta potential analysis. The results indicated that synthesis of hydroxyapatite particles in the presence of the carbon nanotubes had the best result in homogenization of the carbon nanotube dispersion and faster crystallization of hydroxyapatite. The crystallization of hydroxyapatite phase was investigated with differential scanning calorimetry (DSC) and X-ray diffraction...
Fourier optics approach in evaluation of the diffraction and defocus aberration in three-dimensional integral imaging
, Article Computational Modelling of Objects Represented in Images: Fundamentals, Methods and Applications III - Proceedings of the International Symposium, CompIMAGE 2012 ; 2012 , Pages 81-84 ; 9780415621342 (ISBN) ; Kavehvash, Z ; Mehrany, K ; Sharif University of Technology
CRC
2012
Abstract
The unwanted effects of diffraction and defocus aberration in three-dimensional integral imaging are taken into account by using the Fourier optics approach. The concepts of point spread function and optical transfer function widely in use for conventional two-dimensional imaging are generalized and applied to three-dimensional integral imaging systems. The effects of diffraction and defocus aberration are then studied and the performance of the conventional single lens imaging system is compared against that of the integral imaging
Multi-target sputter deposition of Ni50Ti 50 - XHfx shape memory thin films for high temperature microactuator application
, Article Sensors and Actuators, A: Physical ; Volume 121, Issue 2 , 2005 , Pages 543-548 ; 09244247 (ISSN) ; Cao, Y. Z ; Barber, Z. H ; Sharif University of Technology
2005
Abstract
High temperature shape memory NiTiHf thin films with varying hafnium contents up to 28.7 at.% were fabricated by DC magnetron sputtering using simultaneous sputter deposition from separate elemental targets. The required film composition was achieved by adjusting the power ratio to the targets. The as-deposited films were amorphous; a post deposition annealing was performed at 550 °C to crystallize the films. Two-micron thick films were characterized by energy dispersive spectroscopy in a scanning electron microscope, temperature controlled X-ray diffraction, differential scanning calorimetry, and atomic force microscopy. The results showed that above 10 at.% Hf additions the transformation...