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Novel phosphoramidites (1,2) of appropriately protected 2'-deoxyinosine isosteres (I*) such as allopurinol 2'-deoxyribofuranoside (4a) and 7-deaza-2'-deoxyinosine (4b) have been synthesized. They were employed together with the phosphoramidite of 2'-deoxyinosine in solid-phase synthesis of d(GCI*CGC) hexamers (12a-d). From thermodynamic data of these alternating hexamers it was shown that allopurinol 2'-deoxyribofuranoside destabilizes such duplexes less strongly than 2'-deoxyinosine. Additionally, the phosphoramidite of 7-deaza-2'-deoxyinosine (2) exhibits an extraordinary stability of the N-glycosylic bond. Since the new phosphoramidites are structurally related to 2'-deoxyinosine, they can be used in the construction of hybridization probes containing an ambiguous base.

Phosphoramidites of base-modified 2′-deoxyinosine isosteres and solid-phase synthesis of d(GCI*CGC) oligomers containing an ambiguous base

Phosphoramidites of base-modified 2′-deoxyinosine isosteres and solid-phase synthesis of d(GCI^*CGC) oligomers containing an ambiguous base