通过固相合成制备含有核苷6-aza-2'-脱氧尿苷z 6 U d(1a)的寡脱氧核糖核苷酸。由于该核苷的p K a值为6.8,观察到了不希望的副反应。因此,保护了氮3(邻-茴香基保护)。在这种方法中制备的1a亚磷酰胺在允许多次掺入寡核苷酸方面与规范核苷的结构单元一样有效。含有1a的寡核苷酸双链体显示出T m值的pH依赖性。这是由化合物1a上的核碱基去质子化引起的已经处于中立条件下。在锌+2离子存在下研究了金属(M)-DNA的形成。已证明6-氮杂尿嘧啶修饰的双链体已经在中性介质中形成M-DNA,而天然DNA需要碱性条件(pH 8.5以上)。核苷1a的糖部分及其戊基衍生物5a的构象分析表明,在溶液中具有优选的N-构象,而在固态下获得化合物1a的S-构象(单晶X射线分析)。
Synthesis and Evaluation of 6-Aza-2′-deoxyuridine Monophosphate Analogs as Inhibitors of Thymidylate Synthases, and as Substrates or Inhibitors of Thymidine Monophosphate Kinase in Mycobacterium tuberculosis
作者:Martin Kögler、Roger Busson、Steven De Jonghe、Jef Rozenski、Kristien Van Belle、Thierry Louat、Hélène Munier-Lehmann、Piet Herdewijn
DOI:10.1002/cbdv.201100285
日期:2012.3
A series of 5‐substituted analogs of 6‐aza‐2′‐deoxyuridine 5′‐monophosphate, 6‐aza‐dUMP, has been synthesized and evaluated as potential inhibitors of the two mycobacterial thymidylatesynthases (i.e., a flavin‐dependent thymidylatesynthase, ThyX, and a classical thymidylatesynthase, ThyA). Replacement of C(6) of the natural substrate dUMP by a N‐atom in 6‐aza‐dUMP 1a led to a derivative with weak