USE OF 3,4-DIMETHOXYBENZYL GROUP AS A PROTECTING GROUP FOR THE 2′-HYDROXYL GROUP IN THE SYNTHESIS OF OLIGORIBONUCLEOTIDES
作者:Hiroshi Takaku、Tsunehiko Ito、Kazuaki Imai
DOI:10.1246/cl.1986.1005
日期:1986.6.5
4-dimethoxybenzyl group was introduced to the 2′-hydroxylgroup by the reaction of nucleosides with 3,4-dimethoxybenzyl trichloroacetimidate or 3,4-dimethoxybenzyl bromide-NaH. Further, this group can be used as a protectinggroup for the O6-amide group of the guanine residue. The protected nucleosides are useful starting materials for the synthesis of oligoribonucleotides. The 3,4-dimethoxybenzyl group was removed
Synthesis of Oligoribonucleotides by Using 2′-<i>O</i>-(1-Methyl-1-methoxy)ethyl Nucleosides
作者:Hiroshi Takaku、Kazuaki Imai、Koukichi Nakayama
DOI:10.1246/cl.1987.1787
日期:1987.9.5
3′,5′-O-Tetraisopropyldisiloxanylnucleosides smoothly react with 2-methoxypropene to give 2′-O-(1-methyl-1-methoxy)ethyl nucleosides in high yields without formation of diastereoisomers. These nucleosides were used as intermediates for oligonucleotidesynthesis by the phosphotriester method. The (1-methyl-1-methoxy)ethyl group was removed rapidly from oligonucleotides by acid treatment.