Synthesis, gene silencing activity, thermal stability, and serum stability of siRNA containing four (<i>S</i>)-5′-<i>C</i>-aminopropyl-2′-<i>O</i>-methylnucleosides (A, adenosine; U, uridine; G, guanosine; and C, cytidine)
作者:Ryohei Kajino、Shuichi Sakamoto、Yoshihito Ueno
DOI:10.1039/d2ra00705c
日期:——
interference (RNAi) activity. Conversely, the (S)-5′-C-aminopropyl modification in the central region of the passenger strand decreased the RNAiactivity. Furthermore, the siRNAs containing three or four consecutive (S)-5′-C-aminopropyl-2′-O-methylnucleosides at the 3′- and 5′-regions of the passenger strand exhibited RNAiactivity similar to that of the corresponding 2′-O-methyl-modified siRNAs. Finally
在此,我们报道了( S )-5′- C-氨丙基-2′- O-甲基腺苷和( S )-5′- C-氨丙基-2′- O-甲基鸟苷亚磷酰胺的合成以及小干扰RNA的性质(siRNA)含有四个( S )-5'- C-氨丙基-2'- O-甲基核苷(A,腺苷;U,尿苷;G,鸟苷;和C,胞苷)。过客链 3' 和 5' 区域含有 ( S )-5'- C-氨丙基核苷的 siRNA 对于 RNA 干扰 (RNAi) 活性具有良好的耐受性。相反,过客链中心区域的 ( S )-5'- C-氨丙基修饰降低了 RNAi 活性。此外,在过客链的3'-和5'-区域含有三个或四个连续的( S )-5'- C-氨基丙基-2'- O-甲基核苷的siRNA表现出与相应的2'-区域相似的RNAi活性。 ' -O-甲基修饰的 siRNA。最后,观察到与2'- O-甲基修饰相比,( S )-5'- C-氨丙基修饰有效提高了siRNA的血清稳定性。因此,(
Synthesis of Griseolic Acid B by π-Face-Dependent Radical Cyclization
作者:Spencer Knapp、Machender R. Madduru、Zhijian Lu、Gregori J. Morriello、Thomas J. Emge、George A. Doss
DOI:10.1021/ol0167210
日期:2001.11.1
[reaction: see text]. Radical cyclization of 6 affords the bicyclic vinyl ether 9 with the appropriate stereochemistry for elaboration (seven steps) to griseolicacid B (1).