2‘-C-Branched Ribonucleosides: Synthesis of the Phosphoramidite Derivatives of 2‘-<i>C</i>-β-Methylcytidine and Their Incorporation into Oligonucleotides
作者:Xiao-Qing Tang、Xiangmin Liao、Joseph A. Piccirilli
DOI:10.1021/jo981329u
日期:1999.2.1
We describe a strategy for the incorporation of a 2'-C-branched ribonucleoside, 2'-C-beta-methylcytidine, into oligonucleotides via solid-phase synthesis using phosphoramidite derivatives. 4-N-Benzoyl-2'-C-beta-methylcytidine (2b) was synthesized by coupling persilylated 4-N-benzoylcytosine with 1,2,3,5-tetra-O-benzoyl-2-C-beta-methyl-alpha-(and beta)-D-ribofuranose (1) in the presence of SnCl(4) in
我们描述了通过固相合成使用亚磷酰胺衍生物将2'-C-支链核糖核苷2'-C-β-甲基胞苷掺入寡核苷酸的策略。通过将全硅烷基化的4-N-苯甲酰基胞嘧啶与1,2,3,5-四-O-苯甲酰基-2-C-β-甲基-偶合偶联来合成4-N-苯甲酰基-2'-C-β-甲基胞苷(2b)在乙腈中存在SnCl(4)的情况下,α-(和β)-D-呋喃核糖(1),然后在吡啶/甲醇中用NaOH选择性脱保护。通过在DMF中用二叔丁基二氯硅烷/ AgNO(3)处理,将3'-和5'-羟基封端为环状二叔丁基硅烷二醚3。2' 然后通过用叔丁基氯化镁处理,然后在THF中加入叔丁基二甲基甲硅烷基三氟甲磺酸酯,将羟基保护为叔丁基二甲基甲硅烷基醚4a。作为2'-甲硅烷基保护的替代方法,相应的2'-O-四氢吡喃基醚4b通过在催化量的10-樟脑磺酸在亚甲基中存在下用4,5-二氢-2H-吡喃处理3来制备。氯化物。通过用吡啶鎓聚(氟化氢)处理除去4a