Synthesis of a 1‘-Aminomethylthymidine and Oligodeoxyribonucleotides with 1‘-Acylamidomethylthymidine Residues
作者:Peter Grünefeld、Clemens Richert
DOI:10.1021/jo049062o
日期:2004.10.1
1‘-acylamidomethylthymidine residues. Removal of the Alloc protecting group and acylation with the residue of pyrene-1-yl-butanoic acid were achieved on support, using microwave irradiation to ensure full conversion. The UV-melting point of the duplex of the singly and doubly modified decamers with their fully complementary target sequence is 0.1−6.9 °C higher than that of the unmodified control duplex, depending
这里报道的是从2-脱氧核糖开始的1'-氨基甲基胸苷的亚磷酰胺结构单元的10个步骤的合成。支链氨基核苷的骨架由已知的1-氰基-1-溴糖基供体精心设计,所述供体与甲硅烷基化的核碱基的反应提供了1'-氰化物,其被还原为所需的氨基甲基核苷。该ñ-烯丙基氧羰基(Alloc)保护的核苷被转化为亚磷酰胺结构单元,并掺入寡核苷酸5'-GCAT * TATTAC-3'和5'-GCAT * TAT * TAC-3',其中T *表示1'-酰基酰胺基甲基胸苷残基。使用微波辐射以确保完全转化,在载体上除去了Alloc保护基并与with-1-基丁酸的残基酰化。具有完全互补的靶序列的单修饰和双修饰的十聚体的双链体的UV熔点比未修饰的对照双链体的UV熔点高0.1-6.9°C,具体取决于盐浓度。这表明,氨基甲基接头可以在不破坏螺旋结构的情况下,将功能性“有效负载”放置在DNA双链体的小沟中。