Methods for preparing deoxynucleosides from their corresponding ribonucleosides by forming 3-tert-butylphenoxythiocarbonylderivatives of the ribonucleosides and subsequently effecting radical deoxygenation reactions at the carbon atoms to be deoxygenated.
[EN] OLIGONUCLEOTIDES HAVING MODIFIED NUCLEOSIDE UNITS<br/>[FR] OLIGONUCLEOTIDES A UNITES NUCLEOSIDIQUES MODIFIEES
申请人:ISIS PHARMACEUTICALS INC
公开号:WO2003099840A1
公开(公告)日:2003-12-04
Disclosed are oligonucleotides and oligonucleosides that include one or more modified nucleoside units. The oligonucleotides and oligonucleosides are particularly useful as antisense agents, ribozymes, aptamer, siRNA agents, probes and primers or, when hybridized to an RNA, as a substrate for RNA cleaving enzymes including RNase H and dsRNase.
Silylating reagents having a group other than a divalent oxygen separating two silyl groups provide regioselective protection of reactive groups under robust conditions, such as basic conditions used in alkylation, acylation and deoxygenation. In particular, silylating reagents having a group other than oxygen separating two silyl groups are useful for protecting two hydroxy groups of a ribonucleic or deoxyribonucleic acid. Alkylation of a 2′-hydroxy group of a ribonucleoside protected with the inventive silylating agents in the presence of an excess of a mild hindered base such as sodium HMDS may be carried out without protecting the exocyclic amine and oxo functionalities of nucleobases.
Synthesis of Novel 3‘-<i>C</i>-Methylene Thymidine and 5-Methyluridine/Cytidine H-Phosphonates and Phosphonamidites for New Backbone Modification of Oligonucleotides
作者:Haoyun An、Tingmin Wang、Martin A. Maier、Muthiah Manoharan、Bruce S. Ross、P. Dan Cook
DOI:10.1021/jo001699u
日期:2001.4.1
ne)-protected H-phosphonate monomer 7. 5'-O-MMT-protected 3'-C-methylene-modified H-phosphonates 5, 3, and 7 were converted to the corresponding cyanoethyl H-phosphonates 50, 51, and 56 using DCC as a coupling reagent. One-pot three-step reactions of 50, 51, and 56 provided the desired 3'-C-methylene-modified phosphonamidite monomers 8-10. Some of these new3'-methylene-modified monomers 1-10 have
An Efficient Multigram Synthesis of Monomers for the Preparation of Novel Oligonucleotides Containing Isosteric Non-Phosphorous Backbones
作者:Stuart Dimock、Balkrishen Bhat、Didier Peoc'h、Yogesh S. Sanghvi、Eric E. Swayze
DOI:10.1080/07328319708006242
日期:1997.7
The facile preparation of two novel classes of nucleoside analogs for the inclusion as dimeric non-phosphorous containing subunits in chimeric backbones has been accomplished. The concise preparation of 3'-formylnucleosides and 5'-O-(N-methylhydroxylamino)-nucleosides is reported.