This invention relates to n-alkylated synthetic nucleosides and phosphoramidites of high regio-specific purity and stability and for selective deprotection of the protecting group in oligonucleotides for the purpose of synthesis of high purity selectively n-alkylated sequence specific DNA and RNA. Such oligonucleotides are useful for study of mechanism of cytotoxic and mutagenic DNA damage, detection and reversal of cellular cytotoxic and mutagenic damages that occurs from the incorporation of methylated nucleosides, the corresponding phosphates and triphosphates and their precursors, via de novo DNA synthesis. The reagents could be extremely valuable tools as diagnostics and mutagenic reversal reagents. The present invention describes N-1-nitrogen alkylated purine and N-3 nitrogen alkylated pyrimidines with appropriate nucleobase amino protection, which are selectively deprotected with minimal migration of the alkyl substituent under the condition which are required for synthesizing high purity regiospecific N-1 and N-3 nitrogen alkylated oligonucleotides. A novel process has been developed to synthesize N-3 nitrogen alkylated cytidine.
该发明涉及高度区域特异性纯度和稳定性的n-烷基化合成核苷酸和
磷酰胺酯,以及用于选择性去保护寡核苷酸中保护基的目的,以合成高纯度选择性n-烷基化序列特异性DNA和RNA的方法。这种寡核苷酸对于研究细胞毒性和致突变性DNA损伤的机制、检测和逆转由于甲基化核苷酸、相应的
磷酸盐和
三磷酸盐及它们的前体在de novo DNA合成过程中导致的细胞毒性和致突变性损伤非常有用。这些试剂可能作为诊断和致突变逆转试剂非常有价值。本发明描述了具有适当核碱基
氨基保护的N-1氮烷基化
嘌呤和N-3氮烷基化
嘧啶,这些化合物在所需条件下选择性去保护,且烷基取代物的迁移最小,用于合成高纯度区域特异性N-1和N-3氮烷基化寡核苷酸。已开发出一种新的过程用于合成N-3氮烷基化
胞嘧啶。