Synthetic nucleosides and nucleotides. XXI. On the synthesis and biological evaluations of 2'-deoxy-.ALPHA.-D-ribofuranosyl nucleosides and nucleotides.
作者:TOYOFUMI YAMAGUCHI、MINEO SANEYOSHI
DOI:10.1248/cpb.32.1441
日期:——
N4-Benzoyl-2'-deoxycytidine (1) was converted to its 3', 5'-di-O-acetate (2). Compound 2 was smoothly anomerized to its α-counterpart (3) by reaction with trimethylsilyl trifluoromethanesul-fonate (TMS-triflate). Saponification of 3 afforded crystalline α-2'-deoxycytidine (4). Similarly, 3', 5'-di-O-p-toluoyl-2'-deoxythymidine (5) was anomerized to the α-anomer (6), which was then deblocked to give α-2'-deoxythymidine (7). α-2'-Deoxyadenosine (8) and 9-(2-deoxy-α-D-ribofuranosyl)-6-methylthiopurine (9a) were prepared by TMS-triflate-catalyzed trans-2-deoxyribosylation from compound 2 to N6-benzoyladenine and 6-methylthiopurine, respectively. α-5-Fluoro-2'-deoxycytidine (11a) and its β-anomer (11b) were synthesized by the reaction of the trimethylsilyl derivative of N4-p-toluoyl-5-fluorocytosine with 1-O-acetyl-3, 5-di-O-benzoyl-2-deoxy-D-ribofuranose followed by deblocking. Among the compounds related to α-2'-deoxyribonucleosides, compound 4 and 11a showed weak growth-inhibitory activity on mouse leukemic L5178Y cells in culture. Of the nucleoside 5'-triphosphates, α-deoxy ATP had some affinity with DNA polymerase α when activated DNA was used as a template-primer. α-Deoxythymidine 5'-triphosphate (TTP) showed a remarkable inhibitory effect on DNA polymerase β when poly [rA]-oligo dT was used as template-primer.
将 N4-苯甲酰基-2'-脱氧胞苷(1)转化为其 3',5'-二-O-乙酸酯(2)。通过与三氟甲磺酸三甲基硅酯(TMS-triflate)反应,化合物 2 顺利异构化成其 α-对应物(3)。3 的皂化反应得到了结晶α-2'-脱氧胞苷(4)。同样,3', 5'-di-O-p-toluoyl-2'-deoxythymidine (5) 被异构化为 α-异构体 (6),然后脱锁得到 α-2'-deoxythymidine (7)。α-2'-脱氧腺苷(8)和 9-(2-脱氧-α-D-呋喃核糖基)-6-甲基硫嘌呤(9a)是通过 TMS-三late催化反式-2-脱氧核糖基化从化合物 2 分别制备成 N6-苯甲酰基腺嘌呤和 6-甲基硫嘌呤。α-5-氟-2'-脱氧胞苷(11a)及其 β-异构体(11b)是通过 N4-对甲苯甲酰基-5-氟胞嘧啶的三甲基硅烷衍生物与 1-O-乙酰基-3,5-二-O-苯甲酰基-2-脱氧-D-呋喃核糖反应,然后脱锁合成的。在与α-2'-脱氧核苷有关的化合物中,化合物 4 和 11a 对培养中的小鼠白血病 L5178Y 细胞表现出微弱的生长抑制活性。在核苷 5'-三磷酸酯中,α-脱氧 ATP 在以活化 DNA 为模板引物时与 DNA 聚合酶 α 有一定的亲和力;α-脱氧胸苷 5'- 三磷酸酯(TTP)在以聚[rA]-醇溶 dT 为模板引物时对 DNA 聚合酶 β 有显著的抑制作用。