(1R,3R,4R,5S,6S,7S)-7-(2-cyanoethoxy(diisopropylamino)phosphinoxy)-1-(4,4'-dimethoxytrityloxymethyl)-6-acetoxy-5-trifluoroacetylamino-3-(thymin-1-yl)-2-oxabicyclo[2.2.1]heptane | 1186023-96-0

• 分子结构分类: 有机化合物 - 苯类化合物 - 三苯基化合物
• 英文名称: (1R,3R,4R,5S,6S,7S)-7-(2-cyanoethoxy(diisopropylamino)phosphinoxy)-1-(4,4'-dimethoxytrityloxymethyl)-6-acetoxy-5-trifluoroacetylamino-3-(thymin-1-yl)-2-oxabicyclo[2.2.1]heptane
• CAS: 1186023-96-0
• 化学式: C₄₆H₅₃F₃N₅O₁₁P
• 分子量: 939.923
• InChiKey: MQTXGAFRTQQHBR-YESKBBFWSA-N

反应信息

• 作为产物：
  描述：

  (1R,3R,4R,5S,6S,7S)-1-(4,4'-dimethoxytrityloxymethyl)-7-hydroxy-6-acetoxy-5-trifluoroacetylamino-3-(thymin-1-yl)-2-oxa-bicyclo[2.2.1]heptane 、 2-氰乙基N,N-二异丙基氯亚磷酰胺 在 N,N-二异丙基乙胺 作用下， 以 二氯甲烷 为溶剂， 以87.3%的产率得到(1R,3R,4R,5S,6S,7S)-7-(2-cyanoethoxy(diisopropylamino)phosphinoxy)-1-(4,4'-dimethoxytrityloxymethyl)-6-acetoxy-5-trifluoroacetylamino-3-(thymin-1-yl)-2-oxabicyclo[2.2.1]heptane
  参考文献：
  名称：

  Synthesis of Conformationally Locked Carba-LNAs through Intramolecular Free-Radical Addition to C═N. Electrostatic and Steric Implication of the Carba-LNA Substituents in the Modified Oligos for Nuclease and Thermodynamic Stabilities

  摘要：

  The syntheses of the hitherto unavailable parentfully unsubstituted carba-LNA and its C7'-amino and/or C6'-hydroxyl substituted derivatives, have been accomplished by the intramolecular 5-exo free-radical addition to a C4'-tethered C=N to give carba-LNAs with variable hydrophilic substituents at C6'/C7' (amino and/or hydroxyl). They have been introduced into isosequential antisense oligonucleotides (AONs) to examine how their relative electrostatic and steric effects in the minor groove of a putative AON-RNA duplex affect the target affinity, nuclease resistance, and RNase H elicitation. We show that 2'-oxygen in LNA is important in stabilizing the DNA/DNA and DNA/RNA duplexes vis-a-vis the unsubstituted carba-LNA and its other derivatives and that hydrophobic groups at C6'/C7' in both carba-LNA and carba-ENA relatively destabilize the AON/DNA duplex more profoundly than those in the AON/RNA duplexes. Two main factors affect the relative stabilities of AON/DNA versus AON/RNA duplexes: (i) hydration in the minor groove depending upon hydrophilicity vis-a-vis hydrophobicity of the substituents, and (ii) the relative size of the minor groove in the AON/DNA versus AON/RNA duplexes dictates the steric clash with the substituents depending upon their relative chiralities. We also show how the chirality and chemical nature of the C6'/C7' substituents affect the nuclease stability as well as the thermal stability and the RNase recruitment by AON/RNA duplexes.

  DOI：

  10.1021/jo901009w