Synthesis and biological evaluation of nucleosides containing 8-amino-imidazo[1,2-α]pyrazine as an isosteric replacement for adenine
作者:M. Maccoss、L. C. Meurer、K. Hoogsteen、J. P. Springer、G. Koo、L. B. Peterson、R. L. Tolman、E. Emini
DOI:10.1002/jhet.5570300508
日期:1993.10
ol with 2,3-dichloropyrazine, followed by ring closure to the 8-chloroimidazo[1,2-α]pyrazine nucleoside, conversion to the 8-amino derivative and deblocking. A single crystal X-ray structure of the parent 8-amino-3-(β-D-ribofuranosyl)imidazo[1,2-α]pyrazine is described and the conformation compared to that of formycin. The sugar-modified analogs were prepared by subsequent functional group manipulations
描述了许多与嘌呤衍生物有关的新颖C-核苷,其中嘌呤部分已被等排杂环的8-氨基咪唑并[1,2-α]吡嗪取代。制备的核苷包括核糖,3'-脱氧,2',3'-二脱氧和2',3'-不饱和衍生物。这些C-核苷代表含有酸稳定的糖基键的衍生物,并且它们可以被认为是含有腺嘌呤或3-脱氮-九胺的核苷的类似物。母体核苷的制备通过所述的Cl反应来完成官能化糖,(2ξ)-1-氨基-3,6-脱水-1-脱氧-4,5- ö异亚丙基-7- ö三苯甲基D-同种异体-庚醇与2,3-二氯吡嗪,然后闭环成8-氯咪唑并[1,2-α]吡嗪核苷,转化为8-氨基衍生物并解封。描述了母体8-氨基-3-(β-D-呋喃呋喃糖基)咪唑并[1,2-α]吡嗪的单晶X射线结构,并将其构象与甲霉素进行了比较。糖修饰的类似物是通过随后对糖部分进行的官能团操作而制备的。对生物学评价HIV在H9T淋巴细胞培养表明,与DDA相比,核苷没有明显的抗病毒活性。3-d