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Synthesis of 5′-functionalized deoxyribonucleosides (8a–d) and deoxyribonucleoside phosphoramidites (9a–d) for solid-phase capture of DNA sequences. DIEA, N,N-diisopropylethylamine; BP, (a) N6-benzoyladenin-9-yl, (b) N4-benzoylcytosin-1-yl, (c) N2-isobutyrylguanin-9-yl, or (d) thymin-1-yl; i-Pr, isopropyl; DMF, N,N-dimethylformamide.
