Patent ID: 8080644

Claim:
A nucleoside analogue (hereinafter termed “LNA”) of the general formula I wherein X is selected from —O—; B is selected from hydrogen, hydroxy, optionally substituted C 1-4 -alkoxy, optionally substituted C 1-4 -alkyl, optionally substituted C 1-4 -acyloxy, nucleobases, DNA intercalators, photochemically active groups, thermochemically active groups, chelating groups, reporter groups, and ligands; P designates the radical position for an internucleoside linkage to a succeeding monomer, or a 5′-terminal group, such internucleoside linkage or 5′-terminal group optionally including the substituent R 5 ; one of the substituents R 2 , R 2 *, R 3 , and R 3 * is a group P* which designates an internucleoside linkage to a preceding monomer, or a 3′-terminal group; R 2 * and R 4 * together designate a biradical selected from —(CR*R*) r —Y—(CR*R*) s —, —(CR*R*) r —Y—(CR*R*) s —Y—, —Y—(CR*R*) r+s —Y—, —Y—(CR*R*) r —Y—(CR*R*) s — or —(CR*R*) r+s —, each R* is independently selected from hydrogen, halogen, hydroxy, mercapto, amino, optionally substituted C 1-6 -alkoxy, optionally substituted C 1-6 -alkyl, DNA intercalators, photochemically active groups, thermochemically active groups, chelating groups, reporter groups, and ligands, Y is —O—, —S—, 0 (zero) or —N(R N )— where R N is selected from hydrogen and C 1-4 -alkyl, and each of r and s is 0-4 with the proviso that the sum r+s is 1-4, and provided that when the biradical is —(CR*R*) r -Y—(CR*R*) s -, then Y is —S— or —N(R N )—; and each of the substituents R 1 *, R 2 , R 3 , R 5 , and R 5 *, which are present and not involved in P, P* or the biradical, is independently selected from hydrogen, optionally substituted C 1-12 -alkyl, optionally substituted C 2-12 -alkenyl, optionally substituted C 2-12 -alkynyl, hydroxy, C 1-12 -alkoxy, C 2-12 -alkenyloxy, carboxy, C 1-12 -alkoxycarbonyl, C 1-12 -alkylcarbonyl, formyl, aryl, aryloxy-carbonyl, aryloxy, arylcarbonyl, heteroaryl, heteroaryloxy-carbonyl, heteroaryloxy, heteroarylcarbonyl, amino, mono- and di(C 1-6 -alkyl)amino, carbamoyl, mono- and di(C 1-6 -alkyl)-aminocarbonyl, amino-C 1-6 -alkyl-aminocarbonyl, mono- and di(C 1-6 -alkyl)amino-C 1-6 -alkylaminocarbonyl, C 1-6 -alkyl-carbonylamino, carbamido, C 1-6 -alkanoyloxy, sulphono, C 1-6 -alkylsulphonyloxy, nitro, azido, sulphanyl, C 1-6 -alkylthio, halogen, DNA intercalators, photochemically active groups, thermochemically active groups, chelating groups, reporter groups, and ligands, where aryl and heteroaryl may be optionally substituted; and basic salts and acid addition salts thereof.