Pd(0)/Cu(I)-Mediated Direct Arylation of 2′-Deoxyadenosines: Mechanistic Role of Cu(I) and Reactivity Comparisons with Related Purine Nucleosides
作者:Thomas E. Storr、Christoph G. Baumann、Robert J. Thatcher、Sara De Ornellas、Adrian C. Whitwood、Ian J. S. Fairlamb
DOI:10.1021/jo9012282
日期:2009.8.21
8-arylated-2′-deoxyadenosines. Copper(I) appears to have a high binding affinity for 2′-deoxyadenosine, which explains the mandatory requirement for stoichiometric amounts of this key component. The conditions are compared with more general direct arylation protocols, e.g., catalytic Pd, ligand, acid additives, which do not employ copper(I). In each case, no detectable arylation of 2′-deoxyadenosine was noted
Isolation and Characterization of Two Furan-side Photoadducts of 7-Methylpyrido[3,4-c] Psoralen to the Sugar Moiety of 2-Deoxyadenosine
作者:Lucienne Voituriez、Jean Cadet
DOI:10.1111/j.1751-1097.1999.tb07983.x
日期:1999.8
Abstract. The UVA‐mediated photoreaction of the monofunctional 7‐methylpyrido[3,4‐c]psoralen (MePyPs) with 2′‐deoxy‐adenosine was investigated in the dry state. Two main 7‐methylpyrido[3,4‐c]psoralen monoadducts to 2′‐deoxy‐adenosine were isolated by HPLC and characterized by soft ionization mass spectrometry (fast atom bombardment) and extensive 1H NMR analyses including correlation spectroscopy, total
Geometry and Strength of Hydrogen Bonds in Complexes of 2‘-Deoxyadenosine with 2‘-Deoxyuridine
作者:Anita Dunger、Hans-Heinrich Limbach、Klaus Weisz
DOI:10.1021/ja000718e
日期:2000.10.1
However, concentration-dependent 15 N chemical shifts of specifically labeled uridine and adenosine nucleosides indicate a considerable population of Hoogsteen base pairs at ambient temperatures. These results together with a more downfield chemical shift of the Watson-Crick bound imino proton point to a stronger hydrogenbond in Watson-Crick when compared to Hoogsteen base pairs.
已对 3',5'-二-O-乙酰基-2'-脱氧尿苷与 2'-脱氧腺苷衍生物在溶液中的结合进行了核磁共振研究。使用 CDClF2/CDF3 溶剂混合物,在非常低的温度下进行测量,可以在慢交换状态下观察单个配合物。从 125 K 下亚氨基质子共振的 2D NOE 连接性可以将主要物种分配给 Watson-Crick 几何。然而,特定标记的尿苷和腺苷核苷的浓度依赖性 15 N 化学位移表明在环境温度下有相当数量的 Hoogsteen 碱基对。与 Hoogsteen 碱基对相比,这些结果以及 Watson-Crick 结合的亚氨基质子的更低场化学位移表明 Watson-Crick 中的氢键更强。