Synthesis of 4-Thiouridine, 6-Thioinosine, and 6-Thioguanosine 3‘,5‘-<i>O</i>-Bisphosphates as Donor Molecules for RNA Ligation and Their Application to the Synthesis of Photoactivatable TMG-Capped U1 snRNA Fragments
作者:Michinori Kadokura、Takeshi Wada、Kohji Seio、Mitsuo Sekine
DOI:10.1021/jo991432z
日期:2000.8.1
S-(2-cyanoethyl)thionucleosides were converted to the 2'-O-(tert-butyldimethylsilyl)ribonucleoside 3'-phosphoramidite derivatives 7, 18, and 26 or 3',5'-bisphosphate derivatives 8, 19, and 27. Treatment of 8, 19, and 27 with DBU gave thionucleoside 3',5'-bisphosphate derivatives 9, 20, and 28, which were found to be substrates of T4 RNA ligase. These thionucleoside 3',5'-bisphosphates were examined as donors for
通过显着改进的方法以高收率合成了4-硫代尿苷,6-硫鸟嘌呤和6-硫代肌苷3',5'-双磷酸酯(9、20和28)。在前两种化合物中,尿苷和2-N-苯基乙酰鸟苷通过瞬时O-三甲基甲硅烷基化反应转化为相应的4-和6-O-苯磺酰基中间体(2和13),然后使它们与2-反应。氰基乙硫醇在N-甲基吡咯烷存在下分别得到4-硫代尿苷(3)和2-N-苯基乙酰基-6-硫代鸟苷衍生物(14)。这些硫代核苷衍生物的原位二甲氧基三苯甲基化从1和11产生5'掩蔽的产物4和15的高总收率。6-S-(2-氰乙基)-5'-O-(4,4'-二甲氧基三苯甲基)- 6-硫代肌苷(23)通过5'的取代合成 -O-三苯甲基化的6-氯嘌呤核糖苷衍生物22与2-氰基乙硫醇。这些S-(2-氰基乙基)硫代核苷被转化为2'-O-(叔丁基二甲基甲硅烷基)核糖核苷3'-亚磷酰胺衍生物7、18和26或3',5'-双磷酸酯衍生物8、19和27用DBU处