Utility of Azolium Triflates as Promoters for the Condensation of a Nucleoside Phosphoramidite and a Nucleoside in the Agrawal's Stereoselective Synthesis of Nucleoside Phosphorothioates
作者:Mamoru Hyodo、Hirotaka Ando、Hisashi Nishitani、Akira Hattori、Hiroyuki Hayakawa、Masanori Kataoka、Yoshihiro Hayakawa
DOI:10.1002/ejoc.200500403
日期:2005.12
allowed the stereoselective formation of an internucleotide phosphorothioate bond via the above-described condensation using a stereochemically pure phosphoramidite, followed by sulfurization using bis[3-triethoxysilylpropyl]tetrasulfide. The highest diastereoexcess values of the products in the synthesis of dideoxyribonucleoside phosphorothioates using a suitable azolium triflate such as benzimidazolium
本文证明了一些唑鎓三氟甲磺酸盐,如 N-苯基咪唑鎓三氟甲磺酸盐、苯并咪唑鎓三氟甲磺酸盐和 N-甲基苯并咪唑三氟甲磺酸盐,作为促进 5'-O 核苷和立体化学纯 5 立体选择性缩合的促进剂,比 1H-四唑更有用。 '-O-(p,p'-二甲氧基三苯甲基)-3'-O-(4R)-1H,3H-吡咯并[1,2-c]-1,3,2-氧氮杂磷脂}-2-基2' -脱氧核糖核苷 (Rc-1) 或 5'-O-(p,p'-二甲氧基三苯甲基)-3'-O-(4S)-1H,3H-吡咯并[1,2-c]-1,3,2 -oxazaphospholidin}-2-yl 2'-脱氧核糖核苷 (Sc-2)(Agrawal 策略)。唑鎓三氟甲磺酸盐允许通过使用立体化学纯的亚磷酰胺通过上述缩合立体选择性地形成核苷酸间硫代磷酸酯键,然后使用双[3-三乙氧基甲硅烷基丙基]四硫化物进行硫化。在使用合适的三氟甲磺酸唑鎓盐(如苯并咪唑鎓三氟甲磺酸盐、N-甲基苯并咪唑鎓三氟甲磺酸盐或