Oligonucleotides having A-DNA form and B-DNA form conformational geometry
申请人:——
公开号:US20030096979A1
公开(公告)日:2003-05-22
Modified oligonucleotides containing both A-form conformation geometry and B-from conformation geometry nucleotides are disclosed. The B-form geometry allows the oligonucleotide to serve as substrates for RNase H when bound to a target nucleic acid strand. The A-form geometry imparts properties to the oligonucleotide that modulate binding affinity and nuclease resistance. By utilizing C2′ endo sugars or O4′ endo sugars, the B-form characteristics are imparted to a portion of the oligonucleotide. The A-form characteristics are imparted via use of either 2′-O-modified nucleotides that have 3′ endo geometries or use of end caps having particular nuclease stability or by use of both of these in conjunction with each other.
An Improved Process for the Manufacture of 5′-<i>O</i>-(4,4′-Dimethoxytrityl)-<i>N</i><sup>2</sup>-isobutyryl-2′-<i>O</i>-(2-methoxyethyl)guanosine
作者:Andrew K. McPherson、Daniel Capaldi、Lijian Chen、Philip Olsen
DOI:10.1021/acs.oprd.0c00261
日期:2020.11.20
A revised, optimized process for the manufacture of 5′-O-(4,4′-dimethoxytrityl)-N2-isobutyryl-2′-O-(2-methoxyethyl)guanosine (MOE G PNS) that controls critical impurities to less than 0.2% was developed. The 2′-O-alkylation of 2,6-diaminopurine riboside (DAPR) with 1-bromo-2-methoxyethane (MOE-Br) in DMSO was examined using a design of experiments approach, which led to the selection of LiOH as the
Process Research on the Preparation of DMT Protected 2′-<i>O</i>-Methoxyethylguanosine for Oligonucleotide Synthesis in Therapeutic Applications
作者:Shabbir Ali S. Taj、S. Narayanan、S. Suman Meenakshi、Yogesh S. Sanghvi、Bruce S. Ross、Vasulinga T. Ravikumar
DOI:10.1080/15257770802271748
日期:2008.8.28
An optimized process to synthesize DMT protected 2 '-O-methoxyethylguanosine is described. A key step involves the enzymatic deamination of a mixture of alkylated products to selectively afford the desired material without resorting to chromatography for purification. This approach was scaled up to kilogram quantities for use in oligonucleotide therapeutics. [Formula: see text].
PROCESS FOR THE SYNTHESIS OF 2'-O-SUBSTITUTED PURINES
申请人:Ravikumar Vasulinga
公开号:US20080234475A1
公开(公告)日:2008-09-25
The present invention provides an improved process for the synthesis of 2′-O-substituted purine nucleosides. The process includes anhydro or thioanhydro ring opening of a selected 8,2′-cyclopurine nucleoside with a weak nucleophile in the presence of a Lewis acid ester, followed by reduction to afford the desired 2′-O-substituted purine nucleoside.
Human RNase H1 and oligonucleotide compositions thereof
申请人:ISIS Pharmaceuticals, Inc.
公开号:US20040102618A1
公开(公告)日:2004-05-27
The present invention provides oligonucleotides that can serve as substrates for human Type 2 RNase H. The present invention is also directed to methods of using these oligonucleotides in enhancing antisense oligonucleotide therapies.