Stereodefined Synthesis of O3‘-Labeled Uracil Nucleosides. 3‘-[<sup>17</sup>O]-2‘-Azido-2‘-deoxyuridine 5‘-Diphosphate as a Probe for the Mechanism of Inactivation of Ribonucleotide Reductases
作者:Stanislaw F. Wnuk、Saiful M. Chowdhury、Pedro I. Garcia,、Morris J. Robins
DOI:10.1021/jo010899i
日期:2002.3.1
nucleophilic displacement of the 5'-O-tosyl group with tris(tetrabutylammonium) hydrogen pyrophosphate. Model reactions gave (16)O and (18)O isotopomers, and base-promoted hydrolysis of an O(2),2'-cyclonucleoside gave stereodefined access to 3'-[(18)O]-1-(beta-D-arabinofuranosyl)uracil. Inactivation of ribonucleoside diphosphate reductase with 2'-azido-2'-deoxynucleotides results in appearance of EPR signals
2'-[((16)O] -O-苯甲酰基-[(17)O] -5'-O-(叔丁基二甲基甲硅烷基)-O(2),3'-环尿苷衍生物的热解得到更稳定的3 '-[((17)O] -O-苯甲酰基-[(16)O] -5)-O-(叔丁基二甲基甲硅烷基)-O(2),2'-环尿苷异构体,将其转化为3'-[ (17)O] -2'-叠氮基-2'-脱氧尿苷通过叠氮化锂的脱保护和C2'处的亲核开环。通过用三(四丁基铵)焦磷酸氢亲核取代5'-O-甲苯磺酰基制备5'-二磷酸。模型反应产生(16)O和(18)O同位素异构体,O(2),2'-环核苷的碱促进水解产生立体定义的3'-[((18)O] -1-(β-D)通道-阿拉伯呋喃糖基)尿嘧啶。2'-azido-2'使核糖核苷二磷酸还原酶失活