Synthesis of 1′-phenazine-tethered psicofuranosyl oligonucleotides: The thermal stability and fluorescence properties of their duplexes and triplexes
作者:D. Ossipov、J. Chattopadhyaya
DOI:10.1016/s0040-4020(98)00237-3
日期:1998.5
corresponding 6′-O-DMTr protected 4′-phosphoramidite block 13 in three steps [7 → 9 (83%) → 11 (83%) → 13 (83%)], whereas compound 8 was used in the preparation of the modified solid support 14 in four steps [8 → 10 (28%) → 12 (70%) → 14]. Modified 9-mer ODNs 28 – 31 and 18-mer ODNs 22 – 25 were then assembled in a usual manner using automated solid-phase DNA synthesis protocol. The phenazine-tethered
interactions between the chromophore and nucleobases, and thereby influencing the duplex and triplex stability. Fluorescence measurements on single strand to double strand transition indicated that the 5′-tethered polyarenes are stacked only on the neighbouring nucleobases of the opposite strand. In case of 5′-9-N-ethylphenazinium conjugate 36, a comparative NMR and fluorescence measurement has unambiguously
Synthesis of phenazine-tethered arabino and xylofuranosyl oligonucleotide conjugates: The thermal stability and fluorescence properties of their duplexes (DNA-DNA & DNA-RNA) & triplexes
作者:E. Zamaratski、J. Chattopadhyaya
DOI:10.1016/s0040-4020(98)00457-8
日期:1998.7
The synthesis of phenazine (Pzn) tethered ara-U and xylo-U incorporated oligonucleotides, and their properties as DNA-DNA, DNA-RNA duplexes and as triplexes are reported. 2′-O-Pzn-tethered ara-U amidite (11) and Pzn-linked amidite block (4) as well as CPG solid supports functionalised with 2′-O-Pzn-tethered ara-U (10a – 10c) and 3′-O-Pzn-tethered xylo-U succinates (22a – 22c) were used in the solid-phase