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Synthesis of phosphoramidites 1–4. ABz = 6-N-benzoyl-adenin-9-yl; DIPEA = N,N′-diisopropylethylamine; DMTr = 4,4′-dimethoxytrityl; EDC·HCl = 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride; FmocCl = 9′-fluorenylmethyl chloroformate; NMI = N-methylimadazole; PCl = 2-cyanoethyl-N,N′-diisopropylchlorophosphoramidite; Py = pyren-1-yl.
