Linker-Free Fluorophore-Labeled Oligonucleotides: Synthesis of 3′-Fluoresceinylthymidine Building Blocks and their Coupling Reactions
作者:Clemens Richert、Niels Griesang、Eric Kervio
DOI:10.1055/s-2005-870024
日期:——
Reported here are the syntheses of two thymidine derivatives with an amide-linked 6-carboxyfluorescein residue at their 3′-position that are suitable for the synthesis of fluorophore-labeled oligonucleotides. The first is a 5′-phosphoramidite with a pivaloyl-protected carboxyfluorescein residue in the lactone form. It was prepared from 3′-azido-3′-deoxythymidine (AZT) in three steps and 73% overall yield and coupled on solid support. The second is an imidazolide of thymidine 5′-monophosphate that was obtained from AZT in five steps and 48% overall yield. The imidazolide can be coupled to amino-terminated nucleic acids in aqueous solution.
这里报道了两种胸苷衍生物的合成,其 3' 位具有酰胺连接的 6-羧基荧光素残基,适合合成荧光团标记的寡核苷酸。第一种是内酯形式的具有新戊酰保护的羧基荧光素残基的 5'-亚磷酰胺。它由 3'-叠氮基-3'-脱氧胸苷 (AZT) 分三步制备而成,总产率为 73%,并偶联在固体支持物上。第二种是胸苷 5'-单磷酸咪唑化物,由 AZT 分五步得到,总产率为 48%。咪唑化物可以在水溶液中与氨基封端的核酸偶联。