Novel uridin-2′-yl carbamates: synthesis, incorporation into oligodeoxyribonucleotides, and remarkable fluorescence properties of 2′-pyren-1-ylmethylcarbamateElectronic supplementary information (ESI) available: Additional experimental data for compounds 3, 5 and 6. See http://www.rsc.org/suppdata/p1/b1/b111434b/
作者:Vladimir A. Korshun、Dmitry A. Stetsenko、Michael J. Gait
DOI:10.1039/b111434b
日期:2002.4.9
A convenient method for the preparation of uridin-2â²-yl carbamate derivatives is described. The stable 2â²-O-(imidazol-1-ylcarbonyl)-3â²,5â²-O-(tetraisopropyldisiloxane-1,3-diyl)uridine, prepared from uridine, was treated with primary or secondary aliphatic amines to give 2â²-carbamates in high yield. After 3â²,5â²-O-deprotection with triethylamine trihydrofluoride, 5â²-O-dimethoxytritylation, and 3â²-O-phosphitylation with bis(N,N-diisopropylamino)-2-cyanoethoxyphosphine, modified phosphoramidites were obtained and used in machine-assisted synthesis of modified oligodeoxynucleotides containing uridin-2â²-yl carbamate residues bearing various N-substituents. The influence of uridin-2â²-yl carbamate moieties on the stability of modified oligonucleotide duplexes with complementary DNA and RNA was studied by thermal denaturation experiments. Pyrene-modified oligonucleotides
showed a considerable increase in fluorescence intensity upon hybridisation to complementary RNA and interesting binding properties when hybridised to a mismatched DNA.
描述了一种制备尿苷-2′-基脲甲酸酯衍生物的便捷方法。由尿苷制备的稳定2′-O-(咪唑-1-酰基)-3′,5′-O-(四异丙基二硅氧烷-1,3-二基)尿苷与初级或次级脂肪胺反应,生成高产率的2′-脲甲酸酯。在用三乙胺氟化氢进行3′,5′-O-去保护后,再进行5′-O-二甲氧基三苯甲基化和与双(N,N-二异丙基氨基)-2-氰基乙氧基膦的3′-O-磷酸化,获得了改性磷酰胺酯,并用于机器辅助合成含有各种N-取代基的尿苷-2′-基脲甲酸酯残基的改性寡脱氧核苷酸。通过热变性实验研究了尿苷-2′-基脲甲酸酯部分对改性寡核苷酸与互补DNA和RNA的双链稳定性影响。修饰的芘寡核苷酸在与互补RNA杂交时显示出显著的荧光强度增加,并在与错配DNA杂交时表现出有趣的结合特性。