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• W2100630410 endingPage "5085" @default.
• W2100630410 startingPage "5074" @default.
• W2100630410 abstract "We report the design and synthesis of 2′-fluoro cyclohexenyl nucleic acid (F-CeNA) pyrimidine phosphoramidites and the synthesis and biophysical, structural, and biological evaluation of modified oligonucleotides. The synthesis of the nucleoside phosphoramidites was accomplished in multigram quantities starting from commercially available methyl-d-mannose pyranoside. Installation of the fluorine atom was accomplished using nonafluorobutanesulfonyl fluoride, and the cyclohexenyl ring system was assembled by means of a palladium-catalyzed Ferrier rearrangement. Installation of the nucleobase was carried out under Mitsunobu conditions followed by standard protecting group manipulations to provide the desired pyrimidine phosphoramidites. Biophysical evaluation indicated that F-CeNA shows behavior similar to that of a 2′-modified nucleotide, and duplexes with RNA showed slightly lower duplex thermostability as compared to that of the more rigid 3′-fluoro hexitol nucleic acid (FHNA). However, F-CeNA modified oligonucleotides were significantly more stable against digestion by snake venom phosphodiesterases (SVPD) as compared to unmodified DNA, 2′-fluoro RNA (FRNA), 2′-methoxyethyl RNA (MOE), and FHNA modified oligonucleotides. Examination of crystal structures of a modified DNA heptamer duplex d(GCG)-T*-d(GCG):d(CGCACGC) by X-ray crystallography indicated that the cyclohexenyl ring system exhibits both the 3H2 and 2H3 conformations, similar to the C3′-endo/C2′-endo conformation equilibrium seen in natural furanose nucleosides. In the 2H3 conformation, the equatorial fluorine engages in a relatively close contact with C8 (2.94 Å) of the 3′-adjacent dG nucleotide that may represent a pseudo hydrogen bond. In contrast, the cyclohexenyl ring of F-CeNA was found to exist exclusively in the 3H2 (C3′-endo like) conformation in the crystal structure of the modified A-form DNA decamer duplex [d(GCGTA)-T*-d(ACGC)]2. In an animal experiment, a 16-mer F-CeNA gapmer ASO showed similar RNA affinity but significantly improved activity compared to that of a sequence matched MOE ASO, thus establishing F-CeNA as a useful modification for antisense applications." @default.
• W2100630410 created "2016-06-24" @default.
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• W2100630410 date "2012-05-18" @default.
• W2100630410 modified "2023-10-11" @default.
• W2100630410 title "Synthesis and Antisense Properties of Fluoro Cyclohexenyl Nucleic Acid (F-CeNA), a Nuclease Stable Mimic of 2′-Fluoro RNA" @default.
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• W2100630410 doi "https://doi.org/10.1021/jo300594b" @default.
• W2100630410 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3696582" @default.
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