摘要:
Methods are provided for preparing internucleotide phosphorothioate linkages that are enriched in the Sp or Rp enantiomer comprising coupling a synthon with a 2′-substituted nucleoside in the presence of coupling agent that is selected to enhance either the Rp or Spenantiomer according to its pKa.
摘要:
Synthetic processes are provided wherein oligomeric compounds are prepared having phosphodiester, phosphorothioate, phosphorodithioate, or other covalent linkages. The oligomers have substantially reduced exocyclic adducts deriving from acrylonitrile or related contaminants.
摘要:
This invention presents novel methods for synthesizing phosphorothioate oligonucleotides, using support-bound phosphoramidites. Novel intermediates useful in the methods are also provided.
摘要:
Synthetic processes are provided for the solution phase synthesis of oligonucleotides, especially phosphorothioate oligonucleotides, and intermediate compounds useful in the processes. Intermediates having structure are prepared in accord with preferred embodiments.
摘要:
Synthetic processes are provided for the solution phase synthesis of oligonucleotides, especially phosphorothioate oligonucleotides, and intermediate compounds useful in the processes. Intermediates having structure ##STR1## are prepared in accord with preferred embodiments.
摘要:
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.
摘要:
Methods for the formation of sulfurized oligonucleotides are provided. The methods allow for the formation of phosphorothioate linkages in the oligonucleotides or derivatives, without the need for complex solvent mixtures and repeated washing or solvent changes. Oligonucleotides having from about 8, and up to about 50, nucleotides can be sulfurized according to the methods of the invention with higher yields than have been previously reported.