Abstract
Abstract A combination of H-phoshonate and phosphoramidite chemistry has been applied for the automated solid-phase synthesis of oligodeoxyribonucleotides containing 7, 8-dihydro-8-oxo-2′-deoxyguanosine (8-oxodG) residues at predefined positions. The unmodified part of the oligomers has been synthesized by using protected standard phosphoramidites, for the incorporation of 8-oxodG the synthon 2-N-acetyl-5′-0-(4,4′-dimethoxytrityl)-7,8-dihydro-2′-deoxyguanosin-8-one-3′-H-phosphonate, prepared in a five step synthesis via 8-bromo-2′-deoxyguanosine, has been used. This approach combines the advantages of both DNA synthesis strategies in that a high yield of full length oligomers is obtained and unreacted, protected 8-oxodG monomers can be recycled, respectively.
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