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It is possible to enhance targeting of a DNA stem flank domain with a complementary DNA when it is conjugated with diphenyl ether at the branch point. The nucleoside 2'-deoxy-5-methyl- N 4-(4-phenoxyphenyl)cytidine (5) was synthesized from thymidineby tritylation, acetylation, amination via 2,4, 6-trimethylbenzenesulfonyl activation and subsequent de-protection. When a three-way junction is formed with a bulged nucleoside 5 at the branch point, the thermal melting temperature was increased by 9 degreesC when compared with wild-type DNA. When hybridizing to one of the flanks at a stem allowing coaxial stacking to the stem, modification at the branch point resulted in DeltaTm= 5.8 degreesC. For targeting to RNA the results were more ambiguous. RNase H activity was observed in some cases when an intercalating aromatic ring was addressed at the branch point. RNase H activity was observed even for a short 7mer ODN.

Targeting of nucleic acid junctions: addressing to a branch point an oligodeoxynucleotide conjugated with an intercalator