Papers by George Heropoulos
Microwave-assisted Suzuki-Miyaura Cross-Coupling of Free (NH) 3-Bromoindazoles
Current Organic Chemistry, 2013
Tetrahedron Letters, 2007
Synthesis of lithium omega-(m- and p-lithiophenoxy)alkoxides modified with magnesium 2-ethoxyethoxide. Crystal structures of bis[4-(2-hydroxyethoxy)phenyl]mercury and bis[4-(3-hydroxypropoxy)phenyl]mercury
Journal URL: http://www.sciencedirect.com/science/journal/0022328
Synthesis and characterisation of an imino-phosphine dendrimeric ligand and its application in the Heck reaction
Metal Chloride Reductions with Aromatic Radical Anions. The Magnesium Chloride Catalysed Cleavage of Tetrahydrofuran by Sodium Naphthalene Radical Anion
Collection of Czechoslovak Chemical Communications, 2007
Page 1. METAL CHLORIDE REDUCTIONS WITH AROMATIC RADICAL ANIONS. THE MAGNESIUM CHLORIDE CATALYSED ... more Page 1. METAL CHLORIDE REDUCTIONS WITH AROMATIC RADICAL ANIONS. THE MAGNESIUM CHLORIDE CATALYSED CLEAVAGE OF TETRAHYDROFURAN BY SODIUM NAPHTHALENE RADICAL ANION Barry R ...
Highly efficient selective synthesis of mono- and per-substituted b-cyclodextrins in closed-cavity microwave reactors
An iminophosphine dendrimeric ligand and its evaluation in the Heck reaction
Tetrahedron Letters, 2003
... Dimitrios P. Catsoulacos a , Barry R. Steele a , Georgios A. Heropoulos a , Maria Micha-Scret... more ... Dimitrios P. Catsoulacos a , Barry R. Steele a , Georgios A. Heropoulos a , Maria Micha-Screttas a and Constantinos G. Screttas Corresponding Author Contact Information , a , E-mail The Corresponding Author. ... Constantinou Ave., 116 35 Athens, Greece. ...
Journal of Food Science and Technology, 2014
Laetiporus sulphureus is a saprophyte belonging to a specific group of wood-decomposing Basidiomy... more Laetiporus sulphureus is a saprophyte belonging to a specific group of wood-decomposing Basidiomycetes growing on deciduous trees. This fungus has been characterized as a herbal medicine and is also known for its antimicrobial properties. In the present study, high energy extraction techniques using different solvents were compared to obtain maximum yield of the edible fungus Laetiporus sulphureus total lipids. The lipid classes and fatty acid composition of the fruiting bodies' total lipids has been studied using GC-FID and Iatroscan TLC-FID analysis. Among the lipids, the neutral lipids predominated followed by phospholipids and glycolipids. Triglycerides were the most abundant in the neutral lipid fraction, whereas phosphatidylcholine in phospholipids. The existence of relatively high amount of sterols may be correlated to fungus pharmaceutical properties. Total lipids were found to contain high unsaturated degree fatty acids (UFA/SFA>3.4) and dominated of C18:2ω-6, C18:1ω-9 and C16:0 fatty acids. Antibacterial and antifungal properties of mushrooms' lipid extracts from two different solvents were also examined. Results indicated that hexane extracts possessed better antifungal and slightly better antibacterial activity compared to chloroform extracts though both were less active than the commercial antimicrobial agents.
Carbohydrate Research, 2011
New highly soluble b-aminoalcohol b-cyclodextrin (b-CD) derivatives have been synthesized via nuc... more New highly soluble b-aminoalcohol b-cyclodextrin (b-CD) derivatives have been synthesized via nucleophilic epoxide opening reactions with mono-6-amino mono-6-deoxy-permethyl-b-CD and mono-6-amino mono-6-deoxy-b-CD. The binding properties of the b-CD were enhanced by linking aminoalcohol subunits which caused its solubility to improve markedly. The reaction conditions were optimised using microwave irradiation giving moderate-to-good yields with a series of epoxides. A regioselective epoxide opening reaction was observed in the reaction with styrene oxide while the stereoselectivity was strictly dependent on substrate structure.
A question concerning the pk range within which an organic free radical exhibits normal radical behaviour. The case of galvinoxyl
Tetrahedron, 1984
ABSTRACT
The Journal of …, 1999
In this paper, we demonstrate the ability of the ω-lithiooxyalkoxy group to function as an ortho-... more In this paper, we demonstrate the ability of the ω-lithiooxyalkoxy group to function as an ortho-directing substituent in the lithiation of aromatics. The synthetic utility of these new aryllithium reagents has been demonstated by reacting them with a series of electrophiles. In ...
Food microbiology, 2005
Listeria monocytogenes membrane lipid fatty acids (FA) play a role in its cold adaptation. Our pr... more Listeria monocytogenes membrane lipid fatty acids (FA) play a role in its cold adaptation. Our previous study indicated that in newly synthesized neutral lipids, from the early stage of the temperature response (3 days at 5° C), only the anteiso-15: 0 FA was selectively ...
Tetrahedron letters, 2006
A new air-and moisture-stable palladium complex with salicylaldehyde N(4)-hexamethyleneiminylthio... more A new air-and moisture-stable palladium complex with salicylaldehyde N(4)-hexamethyleneiminylthiosemicarbazone has been synthesized. According to its crystal structure, the metal is bonded to 2 equiv monoanionic thiosemicarbazone moieties in a N,S-bidentate fashion, forming two five-membered ...
ChemInform Abstract: Microwave‐Assisted Synthesis of 3,5‐Disubstituted Isoxazoles and Evaluation of Their Antiageing Activity
Cheminform, 2015
Macular carotenoids in lipid food matrices: DOE-based high energy extraction of egg yolk xanthophylls and quantification through a validated APCI(+) LC-MS/MS method
Journal of Chromatography B
Convenient method for the synthesis of 5-(4-methoxyphenyl)-3 H -1,2-dithiole-3-thione (ADT-OMe) and 5-(4-hydroxyphenyl)-3 H -1,2-dithiol-3-thione (ADT-OH) using microwave irradiation
Tetrahedron Letters
Antioxidants (Basel, Switzerland), Jan 24, 2017
Recently there is a great interest in using high energy techniques (HET) which involve microwave ... more Recently there is a great interest in using high energy techniques (HET) which involve microwave or ultrasound-assisted extraction (MAE and UAE) for isolation of natural bioactive compounds from plant foods. Such bioactive compounds are phenolics which were determined from sunflower (Helianthus annuus L.) kernels and hulls (defatted) utilising two different high energy extraction techniques, ultrasound and microwave assisted solvent extraction. All samples were characterised by ultra-high-performance liquid chromatography-electrospray ionization-mass spectrometry (UHPLC-ESI-MS). The effect of parameters such as the nature of the solvent, volume of solvent, temperature and time is discussed. It is proved that the techniques applied had reduced solvent consumption and shorter extraction times, and extraction yields of the analytes were equal to or to some extent higher than those obtained with conventional techniques. Total Phenolic Composition (TPC) of samples examined was studied by...
Microwave-assisted synthesis of 3,5-disubstituted isoxazoles and evaluation of their anti-ageing activity
European Journal of Medicinal Chemistry, 2014
One-pot uncatalysed microwave-assisted 1,3-dipolar cycloaddition reactions between in situ genera... more One-pot uncatalysed microwave-assisted 1,3-dipolar cycloaddition reactions between in situ generated nitrile oxides and alkynes bearing protected antioxidant substituents, were regioselectively afforded 3,5-disubstituted isoxazoles. The yields were moderate, based on the starting aldehydes, while the reaction times were in general shorter than those reported in the literature. The cytoprotective and anti-ageing effect of the final deprotected compounds was evaluated in vitro, on cellular survival following oxidative challenge and in vivo, on organismal longevity using the nematode Caenorhabditis elegans. The activity of the isoxazole analogues depends on the nature and the number of the antioxidant substituents. Analogue 17 bearing a phenolic group and a 6-OH-chroman group is a promising anti-ageing agent, since it increased survival of human primary fibroblasts following treatment with H2O2 and extended C. elegans lifespan.
Transferability-additivity of molar volumes of organic liquids and their relation to normal boiling points
J Org Chem, 1993
ABSTRACT
Tetrahedron Letters, Apr 4, 2005
Sterically demanding nitroaromatic compounds have been prepared and reduced to their correspondin... more Sterically demanding nitroaromatic compounds have been prepared and reduced to their corresponding amines with high intensity ultrasound using hydrazine in the presence of a Raney nickel catalyst. These reactions were dependent on catalyst quality, solvent and ultrasonic amplitude and, in comparison to their silent reactions, proceeded much faster and afforded higher yields.
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Papers by George Heropoulos