Design and Synthesis of Isonucleosides Constructed on a 2-Oxa-6-thiabicyclo[3.2.0]heptane Scaffold
作者:Yuichi Yoshimura、Kazuhiro Asami、Tomozumi Imamichi、Tomoko Okuda、Kimiyasu Shiraki、Hiroki Takahata
DOI:10.1021/jo100556u
日期:2010.6.18
other hand, was converted into the corresponding dimesylate, which was then treated with mercury acetate and trifluoroacetic acid to remove the PMB group. The resulting thiol derivative was treated with DBU to give the desired isonucleoside constructed on a 2-oxa-6-thiobicyclo[3.2.0]heptane scaffold after deprotection. The optimized conformer of the isonucleoside was calculated using DFT at the B3LYP/6-31G**
描述了一种设计和合成含有2-oxa-6-硫代双环[3.2.0]庚烷骨架的异核苷的新方法。2,2-二甲基-1,3-二恶烷-5-酮13通过六个步骤将其转化为二氧杂双环己烷衍生物。用硫醇(硫酚或PMB硫醇)切割环氧基后,将所得产物在核碱基存在下进行Mitsunobu反应。反应通过硫代硫醚基团的迁移进行,得到所需的异核苷衍生物。在苯基硫化物衍生物的情况下,自由基脱硫,然后脱保护,得到4'-取代的2',3'-二脱氧异核苷。另一方面,将PMB硫化物衍生物转化为相应的二甲基磺酸酯,然后将其用乙酸汞和三氟乙酸处理以除去PMB基团。用DBU处理所得的硫醇衍生物,得到脱保护后在2-氧杂-6-硫代双环[3.2.0]庚烷骨架上构建的所需异核苷。