The synthesis and conformation of 2′- and 3′-hypermodified tricyclic nucleosides and their use in the synthesis of novel 2′- or 3′-isomeric 4(7)-substituted isoxazolidine-nucleosides
作者:J. Rong、P. Roselt、J. Plavec、J. Chattopadhyaya
DOI:10.1016/s0040-4020(01)85027-4
日期:1994.4
Intramolecular 1,3-dipolar cycloadditon reactions of a number of -alkenyl nitrones of nucleoside derivatives 7,9,19 and 28 afforded 2′- and 3′-hypermodified tricyclic nucleoside derivatives 10 (56%), 11 (43%), 20(91%) and 29 (75%), respectively. The solution structures of these tricyclic nucleoside derivatives have been investigated using the 3JHH (1H at 500 MHz) and the NMR-derived torsion angle constrained
分子内的一些的1,3-偶极cycloadditon反应核苷衍生物的链烯基硝酮7,9,19和28,得到2'-和3'- hypermodified三环核苷衍生物10(56%),11(43%),20 (91%)和29(75%)。这些三环核苷衍生物的溶液结构已通过MacroModel的AMBER力场使用3 J HH(在500 MHz下为1 H)和NMR衍生的扭转角限制了能量的最小化进行了研究。超修饰核苷衍生物的随后Tamao氧化20和29分别给出了螺-4(7)-取代的异恶唑烷-核苷衍生物21和30。