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Uracil Derivatives (uracil + derivative)
Selected AbstractsChemInform Abstract: Synthesis of Uracil Derivatives and Their Alkylation: An Approach to Peptide Non-nucleic Acid Monomers.CHEMINFORM, Issue 37 2010Madhukar N. Jachak Abstract The introduction of various functionalities at N-1 position of uracils (II) leads to derivatives of type (IV). [source] ChemInform Abstract: Electro-Organic Synthesis of New Pyrimidine (III) and Uracil Derivatives (V).CHEMINFORM, Issue 24 2010Saied Saeed Hosseiny Davarani Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: 1-(2,4-Dinitrophenyl)-5-nitrouracil, a Versatile Reagent for the Synthesis of N1 -Modified Uracil Derivatives.CHEMINFORM, Issue 20 2008A. Gondela Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] [2 + 2] Photocycloadditions with Chiral Uracil Derivatives: Access to All Four Stereoisomers of 2-Aminocyclobutanecarboxylic Acid.CHEMINFORM, Issue 47 2007Carlos Fernandes Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Synthesis of Substituted Uracil Derivatives from the Acetates of the Baylis,Hillman Adducts.CHEMINFORM, Issue 29 2005Chang Gon Lee Abstract For Abstract see ChemInform Abstract in Full Text. [source] Time-dependent and time-independent approaches for the computation of absorption spectra of Uracil derivatives in solutionINTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY, Issue 3 2010Roberto Improta Abstract In this contribution we discuss the most significant benefits and drawbacks of the alternative time-independent (TI) and time-dependent (TD) approaches to the calculation of absorption spectra of molecules in solutions. Eigenstate-free TD methods are in principle the most suitable route to face with the calculation of optical spectra in nonadiabatic systems, most of all in presence of conical intersections easily accessible from the Franck,Condon region. However, here we show that, in selected cases, a combined strategy that adopts TD methods to assess the impact of nonadiabatic couplings on the spectrum and subsequently applies TI methods to include all the degrees of freedom can reveal very convenient. Such a combined TD/TI strategy has been applied to the calculation of the spectrum of Uracil and 5Fluoro-Uracil in acetonitrile. TD studies on reduced dimensionality diabatic models indicate that nonadiabatic effects are moderate and are not the main origin of the diffuse spectral shapes observed in experiments. Subsequent full-coordinate TI calculations allow assigning this feature to intrinsic characteristics of a ,,* excitation of a small molecular ring structure. This latter introduces remarkable deformation in all the ring structure thus inducing a FC activity in many molecular normal modes both due to displacements of the equilibrium structures and to Duschinsky mixings of the normal coordinates. © 2009 Wiley Periodicals, Inc. Int J Quantum Chem, 2010 [source] Synthesis of 1,2-Disubstituted Carbocyclic Nucleoside Analogues of CytidineHELVETICA CHIMICA ACTA, Issue 5 2006José González-Moa, María Abstract The synthesis of new 1,2-disubstituted, five- or six-ring-carbocyclic nucleoside analogues of cytidine, compounds 1 and 2a,d, are described. These compounds were obtained by aminolysis, starting from the corresponding uracil derivative, via nucleophilic displacement of a triazolyl (Scheme,1) or a (2,4,6-triisopropylphenyl)sulfonyl (TPS) group (Scheme,2) at 4-position of the pyrimidine ring. [source] | ||||||||||