SYNTHESIS OF SOME 2′- AND 3′-FLUOROALKYL SUBSTITUTED NUCLEOSIDES AND OLIGONUCLEOTIDES
作者:Pawel J. Serafinowski、Catherine A. Brown、Colin L. Barnes
DOI:10.1081/ncn-100002459
日期:2001.3.31
(1,2,3). The synthesis of target oligonucleotides entailed prior preparation of the appropriate nucleoside precursors. It was found that reaction of suitably protected 2′and 3′-ketonucleosides with crystalline bromodifluoromethyl[tris (dimethylamino)]-phosphonium bromide in the presence of zinc gave 2′and 3′-difluoromethylene nucleosides in high yields (4–6). Subsequently, these compounds were used as
作为开发反义寡核苷酸的程序的一部分,作为癌基因表达的选择性抑制剂,其目的是研究在2'或3'-位被二氟亚甲基,二氟甲基和三氟甲基修饰的寡核苷酸的特性。预期此类寡核苷酸可能具有增加的针对核酸酶的稳定性以及改善的杂交性质和运输特性(1,2,3)。靶寡核苷酸的合成需要事先制备合适的核苷前体。发现在锌存在下,适当保护的2'和3'-酮核苷与结晶溴代二氟甲基[三(二甲基氨基)]-溴化reaction的反应可高产率获得2'和3'-二氟亚甲基核苷(4-6)。随后,这些化合物用作进一步转化的起始原料。因此,将2'-脱氧-2'-二氟亚甲基-5'-O-二甲氧基三苯甲基吡啶(3)和3'-脱氧-3'-二氟亚甲基-5'-O-二甲氧基三苯甲基吡啶(4)氢化,分别得到相应的2'和3'-二氟甲基尿苷衍生物2a / 2b(苏/赤6:1)和5a / 5b(苏/赤8:1)。化合物2a / 2b和5a / 5b的去三苯甲基化可提供两对非对映异构体3a