protected shortened AMP analogue with adenosine derivatives, however, provided only the 2′,5′-linked ApA analogue. Study on hybridization of the modified2′-5′ ApA with polyU revealed its ability to form stable triplex-like complex, similar to natural 2′-5′ r(ApA) and 3′-5′ r(ApA). NMR spectroscopy study showed that the erythrofuranose part of the phosphonate nucleotide unit of modified2′-5′ ApA was predominantly
for the protection of the 2′-OH groups of ribonucleoside residues in the synthesis of oligoribonucleotides by the phosphoramidite approach en a solid support, using the acid-labile 5′-O-dimethaxytrityl (DMTr) group. This group is completely stable under the acidic conditions required to remove the 5t́-terminal protecting groups in oligonucleotide synthesis on a solid support, and yet is easily removable