Browsing QO-Artigos by Issue Date
Now showing items 1-20 of 346
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Methyl derivatives of tetracyclic psoralen analogues: antiproliferative activity and interaction with DNA
(Arkat USA Inc, 2004)A number of new tetracyclic psoralen derivatives were studied. The fourth ring is constituted by cyclopentane (4, 7 and 9), cyclohexane (11, 15 and 18) or benzene (12, 16 and 20) fused to either 4',5' or 3,4 photoreactive ... -
3-O-Benzyl-6-O-benzoyl-1,2-Oisopropilidene-5-C-nitromethyl-a-Dglucofuranose
(International Union of Crystallography, 2008)The title compound, C24H27NO9, is one of the epimers of the Henry reaction of 3-O-benzyl-6-O-benzoyl-2-O-isopropylidene-a-D-glucofuran-5-one with nitromethane. The conformation of the five membered rings is as expected ... -
Ethyl 1-O-tert-butyldimethylsilyl-2,3-Oisopropylidene-5-[(20S)-tetrahydropyran2-yloxy]-D-glycero-a-D-manno-heptofuronate
(International Union of Crystallography, 2008)The title compound {systematic name: (2S,3R)-ethyl 3- [(3aS,4R,6S,6aS)-6-tert-butyldimethylsilyloxy-2,2-dimethylperhydrofuro[3,4-d][1,3]dioxol-4-yl]-2-nitro-3-[(S)-tetrahydro-2H-pyran-2-yloxy]propanoate}, C23H41NO10Si, ... -
Methyl 2-diphenylphosphoryloxy-2-azabicyclo[2.2.1]hept-5-ene-3-exocarboxylate
(International Union of Crystallography, 2009)In the title compound, C20H20NO4P, the dihedral angle between the phenyl rings is 68.52 (7) . In the crystal structure, the molecules are linked by a weak C—H(arene) interaction along [010] involving the phenyl CH group ... -
(1RS,4RS,5RS)-Methyl 2-(3,5-dinitrobenzoyl)-2-oxa-3-azabicyclo[3.3.0]oct-7-ene-4-carboxylate
(International Union of Crystallography, 2009)In organic synthesis, the usual techniques as NMR, mass or infra-red spectrometry and elemental analysis are often not enough for the unequivocally determination of a structure of a compound. When it is possible to ... -
Tyrosinase inhibitor activity of coumarin-resveratrol hybrids
(MDPI, 2009)In the present work we report on the contribution of the coumarin moiety to tyrosinase inhibition. Coumarin-resveratrol hybrids 1-8 have been resynthesized to investigate the structure-activity relationships and the IC50 ... -
Host-Guest Complexation Studied by Fluorescence Correlation Spectroscopy: Adamantane–Cyclodextrin Inclusion
(MDPI, 2010)The host-guest complexation between an Alexa 488 labelled adamantane derivative and β-cyclodextrin is studied by Fluorescence Correlation Spectroscopy (FCS). A 1:1 complex stoichiometry and a high association equilibrium ... -
Host-guest complexation studied by fluorescence correlation spectroscopy: adamantane–cyclodextrin inclusion
(MDPI, 2010)The host-guest complexation between an Alexa 488 labelled adamantane derivative and β-cyclodextrin is studied by Fluorescence Correlation Spectroscopy (FCS). A 1:1 complex stoichiometry and a high association equilibrium ... -
A ‘click chemistry’ approach to the straightforward synthesis of new 4-aryl-1,2,3-triazolocarbanucleosides
(Arkat USA Inc, 2010)The synthesis and biological evaluation as antiviral agents of a series of racemic 4-aryl-1,2,3- triazolyl carbanucleosides of type (±)-10/(±)-11 related to the broad spectrum antiviral agent ribavirin 1 are described. ... -
Synthesis and vasorelaxant and platelet antiaggregatory activities of a new series of 6-Halo-3-phenylcoumarins
(MDPI, 2010)A series of 6-halo-3-hydroxyphenylcoumarins (resveratrol-coumarins hybrid derivatives) was synthesized in good yields by a Perkin reaction followed by hydrolysis. The new compounds were evaluated for their vasorelaxant ... -
Cyclization by Catalytic Ruthenium Carbene Insertion into Csp3-H Bonds
(Wiley, 2011)A novel tandem Ru-catalyzed carbene addition to terminal alkynes/insertion of Csp3–H bonds in alkynyl acetals, ethers and amines has been accomplished under mild conditions. This cascade provides an efficient approach to ... -
Click Chemistry with Polymers, Dendrimers, and Hydrogels for Drug Delivery
(Springer, 2012)During the last decades, great efforts have been devoted to design polymers for reducing the toxicity, increasing the absorption, and improving the release profile of drugs. Advantage has been also taken from the inherent ... -
Click Chemistry for Drug Delivery Nanosystems
(Springer, 2012)The purpose of this Expert Review is to discuss the impact of click chemistry in nanosized drug delivery systems. Since the introduction of the click concept by Sharpless and coworkers in 2001, numerous examples of click ... -
Enantioselective Annulation Reactions of Bisenolates Prepared Through Dearomatization Reactions of Aromatic and Heteroaromatic Diesters
(Wiley, 2012)A one‐pot, enantioselective strategy for the dearomatization–annulation of aromatic diesters to give a range of highly functionalized polycyclic molecules with excellent enantioselectivity is presented. This methodology ... -
PEG-dendritic block copolymers for biomedical applications
(Royal Society of Chemistry, 2012)The incorporation of poly(ethylene glycol) (PEG) chains at the focal point of dendrimers results in customizable platforms where the careful selection of the PEG length, the nature of the peripheral groups, and the structure ... -
Gold(I)‐Catalyzed Intermolecular [2+2] Cycloadditions between Allenamides and Alkenes
(Wiley, 2012)3‐(Propa‐1,2‐dien‐1‐yl)oxazolidin‐2‐one works as an efficient two‐carbon partner in a variety of intermolecular gold‐catalyzed [2+2] cycloadditions to alkenes. The transformation represents a simple and practical entry to ... -
Temporary Electrostatic Impairment of DNA Recognition: Light‐Driven DNA Binding of Peptide Dimers
(Wiley, 2012)Appending negatively charged Glu8 tails to a peptide dimer derived from the GCN4 transcription factor leads to an effective suppression of its DNA binding. The specific DNA recognition can be restored by irradiation with ... -
Straightforward access to bisbenzamidine DNA binders and their use as versatile adaptors for DNA-promoted processes
(Royal Society of Chemistry, 2012)Bisbenzamidines are an important family of minor groove DNA-binding agents. We present a one-step synthesis of aromatic aza-bisbenzamidines that allows straightforward and versatile access to a large number of these ... -
Commercial bee pollen with different geographical origins: A comprehensive approach
(MDPI, 2012)Since the primordial of humanity, pollen has been considered a good source of nutrients and energy. Its promising healing properties have also been referred to. The present study aimed to characterize, for the first time, ... -
Comprehensive study of honey with protected denomination of origin and contribution to the enhancement of legal specifications
(MDPI, 2012)In this study the characterization of a total of 60 honey samples with Protected Denomination of Origin (PDO) collected over three harvests (2009–2011, inclusive), from the Northeast of Portugal was carried out based on ...