摘要:
Oligonucleotide analogs are disclosed having pyrimidine monomeric sub-units therein that are modified at the 2′ and 5 positions. Monomeric sub-units having these modifications may be further modified at the 2 position. Improved processes for the synthesis of 2′-O-substituted pyrimidine nucleosides are also provided. The processes feature alkylation of a 2,2′-anhydropyrimidine nucleoside or a 2S,2′-anhydropyrimidine nucleoside with a weak nucleophile in the presence of a Lewis acid.
摘要:
Oligonucleotide analogs are disclosed having pyrimidine monomeric sub-units therein that are modified at the 2' and 5 positions. Monomeric sub-units having these modifications may be further modified at the 2 position.
摘要:
Oligonucleotide analogs are disclosed having pyrimidine monomeric sub-units therein that are modified at the 2′ and 5′ positions. Monomeric sub-units having these modifications may be further modified at the 2′ position. Improved processes for the synthesis of 2′-O-substituted pyrimidine nucleosides are also provided. The processes feature alkylation of a 2,2′-anhydropyrimidine nucleoside or a 2S,2′-anhydropyrimidine nucleoside with a weak nucleophile in the presence of a Lewis acid.
摘要:
Improved processes for the synthesis of 2'-O-substituted pyrimidine nucleosides are provided. The processes feature alkylation of a 2,2'-anhydropyrimidine nucleoside or a 2S,2'-anhydropyrimidine nucleoside with a weak nucleophile in the presence of a Lewis acid.
摘要:
Improved processes for the synthesis of 2'-O-substituted pyrimidine nucleosides are provided. The processes feature alkylation of a 2,2'-anhydropyrimidine nucleoside or a 2S,2'-anhydropyrimidine nucleoside with a weak nucleophile in the presence of a Lewis acid.
摘要:
Compositions and methods are provided for the modulation of expression of the human ras gene in both the normal and activated forms. Oligonucleotides are provided that have methylene(methylimino) linkages alternating with phosphorothioate or phosphodiester linkages. Further oligonucleotides are provide that have a first region having a methylene(methylimino) linkage alternating with a phosphorothioate or phosphodiester linkage and a second region having phosphorothioate linkages. Such oligonucleotides can be used for diagnostics as well as for research purposes including methods for diagnosis, detection and treatment of conditions arising from the activation of the H-ras gene.
摘要:
Novel compounds that mimic and/or modulate the activity of wild-type nucleic acids. In general, the compounds contain a selected nucleoside sequence wherein the nucleosides are covalently bound through linking groups that contain adjacent nitrogen atoms.
摘要:
Methods for preparing oligonucleotide analogs which have improved nuclease resistance and improved cellular uptake are provided. In preferred embodiments, the methods involve radical coupling of 3'- and 5'-substituted or 5'- and 3'-subutituted nucleosidic synthons.
摘要:
Compositions and methods are provided for the modulation of expression of the human ras gene in both the normal and activated forms. Oligonucleotides are provided that have methylene(methylimino) linkages alternating with phosphorothioate or phosphodiester linkages. Further oligonucleotides are provide that have a first region having a methylene(methylimino) linkage alternating with a phosphorothioate or phosphodiester linkage and a second region having phosphorothioate linkages. Such oligonucleotides can be used for diagnostics as well as for research purposes including methods for diagnosis, detection and treatment of conditions arising from the activation of the H-ras gene.
摘要:
Novel compounds that mimic and/or modulate the activity of wild-type nucleic acids are provided. The novel compounds have modified internucleoside linkages which preferably replace naturally-occurring phosphodiester-5'-methylene linkages with four atom linking groups. Preferred linkages have structures such as, for example, CH.sub.2 --R.sub.A --NR.sub.1 --CH.sub.2, CH.sub.2 --NR.sub.1 --R.sub.A --CH.sub.2, R.sub.A --NR.sub.1 --CH.sub.2 --CH.sub.2, CH.sub.2 --CH.sub.2 --NR.sub.1 --R.sub.A, CH.sub.2 --CH.sub.2 --R.sub.A --NR.sub.1, or NR.sub.1 --R.sub.A --CH.sub.2 --CH.sub.2 where R.sub.A is O or NR.sub.2. These linkages are prepared from appropriately functionalized nucleosides and oligonucleotides.