Journal
MOLECULES
Volume 25, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/molecules25020346
Keywords
bridged nucleic acid; post-synthetic modification; modified oligonucleotides; 2 '-urea-LNA; UV-melting experiment
Funding
- Uehara Memorial Foundation, Japan
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The post-synthetic modification of an oligonucleotide is a powerful strategy for the synthesis of various analogs of the oligonucleotide, aiming to achieve the desired functions. In this study, we synthesized the thymidine phosphoramidite of 2 '-N-pentafluorophenoxycarbonyl-2 '-amino-LNA, which was introduced into oligonucleotides. Oligonucleotides containing a 2 '-N-pentafluorophenoxycarbonyl-2 '-amino-LNA unit could be isolated under ultra-mild deprotection conditions (50 mM K2CO3 in MeOH at room temperature for 4 h). Moreover, by treatment with various amines as a post-synthetic modification, the oligonucleotides were successfully converted into the corresponding 2 '-N-alkylaminocarbonyl-2 '-amino-LNA (2 '-urea-LNA) derivatives. The duplex- and triplex-forming abilities of the synthesized oligonucleotides were evaluated by UV-melting experiments, which showed that 2 '-urea-LNAs could stabilize the nucleic acid complexes, similar to the proto-type, 2 '-amino-LNA. Thus, 2 '-urea-LNAs could be promising units for the modification of oligonucleotides; the design of a substituent on urea may aid the formation of useful oligonucleotides. In addition, pentafluorophenoxycarbonyl, an amino moiety, acted as a precursor of the substituted urea, which may be applicable to the synthesis of oligonucleotide conjugates.
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