Efficient synthesis of functionalized oligodeoxyribonucleotides with base-labile groups using a new silyl linker Original Research Article

In this study, we developed new 3′-terminal deoxyribonucleoside-loading reagents 1 with a new silyl-type linker. These reagents could increase the efficiency of introduction of 3′-terminal deoxyribonucleoside components into polymer supports to a level of 17–29 μmol/g. The efficiency was higher than that of previous T-loading reagents because reagents 1 contain a 4-aminobutyryl residue as a spacer. Moreover, we could synthesize not only unmodified DNA oligomers but also a base-labile modified DNA oligomer using resins 9a–d in the activated phosphite method without base protection.