Abstract
2′- O-(1 H-Tetrazol-5-yl)ethyladenosine was synthesized using 2′- O-cyanoethyladenosine derivative as a key intermediate. The 2′- O-(1 H-tetrazol-5-yl)ethyl modifications exhibited intriguing properties such as the change in the structure of the tetrazole residue between a protonated and a deprotonated form. The T m experiments of various oligodeoxynucleotides having a 2′- O-(1 H-tetrazol-5-yl)ethyl-modified adenosine showed reduced hybridization affinity in comparison to the unmodified oligonucleotides toward their complementary oligodeoxynucleotides. The mechanism of the reduced hybridization affinity was discussed on the basis of the structure and the physicochemical properties of the tetrazole moiety.
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