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    • 41. 发明授权
    • Nucleosides and oligonucleotides for studies on reversal of cytotoxic and mutagenic damage of DNA potential diagnostics tools
    • 用于DNA潜力诊断工具逆转细胞毒性和诱变性损伤研究的核苷和寡核苷酸
    • US08785619B1
    • 2014-07-22
    • US11018567
    • 2004-12-20
    • Sant K. SrivastavSuresh C. SrivastavaSatya P Bajpai
    • Sant K. SrivastavSuresh C. SrivastavaSatya P Bajpai
    • C07H19/20C07H19/04C07H21/00
    • C07H21/00C07H19/06C07H19/16Y02P20/55
    • 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.
    • 本发明涉及具有高区域特异性纯度和稳定性的N-烷基化合成核苷和亚磷酰胺,并且为了合成高纯度选择性N-烷基化序列特异性DNA和RNA的目的,寡核苷酸中保护基的选择性脱保护。 这种寡核苷酸可用于研究通过从头DNA合成从引入甲基化核苷,相应的磷酸酯和三磷酸酯及其前体而发生的细胞毒性和诱变性DNA损伤,检测和逆转细胞毒性和诱变性损伤的机制。 这些试剂可以作为诊断和诱变反转试剂非常有价值的工具。 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,其在合成高纯度区域特异性N-1所需的条件下以极少的烷基取代基迁移选择性脱保护, N-3氮烷基化寡核苷酸。 已经开发了一种合成N-3氮烷基化胞苷的新方法。