已经确定并比较了荧光 1,3,4,6-四氮杂戊烯的 X 射线晶体结构,它们是顺式和反式双取代的嘧啶酮环或嘧啶酮和吡啶环的组合。Syn-二取代的四氮杂戊烯是通过三步序列从 1-乙基胞嘧啶或 O-保护的胞苷(也是 O-保护的腺苷)、氯乙烯二乙缩醛和 2-氨基吡啶或另一个胞嘧啶或胞苷单元合成的。最后一步是借助 I III 化合物进行氧化环化。带有末端嘧啶酮环或嘧啶酮和吡啶环的反二取代四氮杂戊烯通过用氨或甲醇钠在甲醇中处理从相应的顺式化合物中获得。基于连接到 1,3,4 的两个胞苷单元的反四环系统,
Nucleoside and Nucleotide Analogues with Quaternary Carbon Centers and Methods of Use
申请人:Guindon Yvan
公开号:US20100093737A1
公开(公告)日:2010-04-15
The present invention comprises compounds useful as antiviral or antitumor agents. The compounds comprise nucleotide analogues that comprise tetrahydrofuranyl or tetrahydrothienyl moeities with quaternary centers at the 3′ position. The nucleotide analogues can be used to inhibit cancer or viruses. Accordingly, the compounds of the present invention are useful for treating, preventing, and/or inhibiting diseases or conditions associated with cancers and viruses. Thus, the present invention also comprising pharmaceutical formulations comprising the compounds and methods of using the compounds and formulations to inhibit viruses or tumors and treat, prevent, or inhibit the foregoing diseases.
Cytosine has been readily alkylated with trialkylphosphates to give the corresponding N-alkyl derivatives, trimethyl phosphate being especially useful for the N-methylation of the base moiety of cytosine nucleosides.
[EN] CYCLOBUTYL NUCLEOSIDE ANALOGS AS ANTI-VIRALS<br/>[FR] ANALOGUES NUCLÉOSIDIQUES CYCLOBUTYLIQUES UTILISÉS COMME ANTI-VIRAUX
申请人:JANSSEN BIOPHARMA INC
公开号:WO2020121122A1
公开(公告)日:2020-06-18
Described herein are cyclobutyl nucleoside analogs of Formula (I), pharmaceutical compositions that include one or more cyclobutyl nucleoside analogs and methods of using the same to treat HBV, HDV and/or HIV.
A series of lipophilicnucleobases that are substituted at the 5- (pyrimidines) or 8- (purines) position with either a halogen atom or a terminal triple bond have been synthesized. The sequences and reactions studied in this work, which mainly comprise halogenation, alkylation, Sonogashira coupling, and trimethylsilylacetylene deprotection, have been carefully optimized, to reach the final compounds
Thermodynamic Effect of Complementary Hydrogen Bond Base Pairing on Aromatic Stacking Interaction in the Guanine-X-Trp Complex (X=Adenine, Guanine, Cytosine, Thymin.
Four kinds of X-Trp (X=adenine, guanine, cytosine, thymine) were synthesized as model compounds to investigate the effect of complementary hydrogen bond base pairing on the stacking interaction of Trp with nucleic acid base. Association constants (Ka) of these compounds with two guanine derivatives (9-ethylguanine and 9-ethyl-7-methylguanine) were determined by Eadie-Hofstee plots of 1H-NMR titration experiments, and the thermodynamic parameters (ΔH, ΔS and ΔG) for the respective complexes were obtained by van't Hoff analyses based on the temperature dependence of the Ka values. The complexes were characterized by enthalpy/entropy compensations, where the interaction of cytosine-Trp with guanine derivatives was largely enthalpy-driven, accompanied by a small entropy component, whereas those of remaining complexes were all associated with a large increase in entropy, accompanied by a small positive enthalpy component. The present insight on the binding of X-Trp with a guanine base provides a thermodynamic basis for the importance of cooperative hydrogen bond pairing and aromatic stacking interactions in the specific recognition of a nucleic acid base pair by protein.