5'-Levulinyl and 2'-tetrahydrofuranyl protection for the synthesis of oligoribonucleotides by the phosphoramidite approach. |
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| Authors: | S Iwai and E Ohtsuka |
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| Affiliation: | Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan. |
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| Abstract: | The levulinyl group has been employed for protection of the 5'-hydroxyl group in the synthesis of oligoribonucleotides by the phosphoramidite approach, using the acid-labile 2'-tetrahydro-furanyl group. The hydrazine treatment was performed for 10 minutes in order to remove the levulinyl group on controlled pore glass. Four decaribonucleotides (AAAAAAAAAU, GGGGGGGGGU, CCCCCCCCCU and UUUUUUUUUU) and a heneicosamer (GCCUAGCUGAUGAAGGGUGAU) were prepared with an automatic synthesizer in good yields. |
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