Nucleosides and nucleotides. XII. Synthesis and properties of 2'-deoxy-2'-mercaptouridine and its derivatives.
作者:MASAOKI IMAZAWA、TOHRU UEDA、TYUNOSIN UKITA
DOI:10.1248/cpb.23.604
日期:——
New thiosugar nucleosides, 2'-deoxy-2'-mercaptouridine (III), its disulfide (IV), 2'-deoxy-2'-mercapto-3', 5'-di-O-acetyluridine (V), and 2'-deoxy-2'-methyl-thiouridine (VI) have been synthesized. The present synthetic method involves the use of 2'-deoxy-2'-acetylthio-3', 5'-di-O-acetyluridine (II) as the intermediate which was obtained by the reaction of 2, 2'-cyclo-3', 5'-di-O-acetyluridine (I) with thioacetic acid. The proton magnetic resonance (PMR) data of these compounds suggested that the introduction of sulfuratom at 2'-position resulted in the furanose ring puckering that is extremely biased to C2' endo-mode. 2'-Deoxy-2', 6-epithio-5, 6-dihydro-arabinofuranosyluracil (VIIIb), the 2'-epimer of III in an 2', 6-epithio form, was also synthesized.
新型硫糖核苷,包括2'-脱氧-2'-巯基尿苷 (III)、其二硫化物 (IV)、2'-脱氧-2'-巯基-3',5'-二-O-乙酰尿苷 (V) 和2'-脱氧-2'-甲基硫尿苷 (VI) 已被合成。当前的合成方法使用2'-脱氧-2'-乙酰硫-3',5'-二-O-乙酰尿苷 (II) 作为中间体,后者是通过2,2'-环式-3',5'-二-O-乙酰尿苷 (I) 与硫代乙酸反应获得的。这些化合物的质子核磁共振 (PMR) 数据表明,在2'位引入硫原子导致呋喃环呈现明显偏向C2'内向的扭曲。此外,2'-脱氧-2',6-硫醇-5,6-二氢阿拉伯呋喃糖基尿嘧啶 (VIIIb),也是III的2'-表异构体,在2',6-硫醇形式下合成。