[GRAPHICS]A new solution-phase phosphoramidite approach is reported for oligonucleotide synthesis employing recyclable solid-supported reagents. It uses polyvinyl pyridinium tosylate as the activator of a nucleoside-3'-O-phosphoramidite in the coupling step with a 5'-OH nucleoside or dinucleotide. The resulting phosphite triester was either sulfurized or oxidized using polystyrene-bound trimethylammonium tetrathionate or periodiate. This method avoids complicated purification steps, as excess reagents are easily removed by filtration.
Proton-Block Strategy for the Synthesis of Oligodeoxynucleotides without Base Protection, Capping Reaction, and P−N Bond Cleavage Reaction
作者:Mitsuo Sekine、Akihiro Ohkubo、Kohji Seio
DOI:10.1021/jo034204k
日期:2003.7.1
longer oligomer, d[CpApGpTpCpApGpTpCpApGpT], a mixed solvent of CH(3)CN-N-methylpyrrolidone (1:1, v/v) was superior to THF so that the desired oligodeoxynucleotide could be isolated in a satisfactory yield. These results suggest that DNA synthesis can be carried out simply by using the protonated bases at the oligomer level not only without base protection but also without the capping reaction and the
A protocol for the solution-phasesynthesis of branched oligodeoxynucleotides was developed that can be scaled up readily and that provides products with the ability to form materials through base pairing.