초록 ▼

The present invention relates to improved methods for the preparation of nucleoside phosphoramidites and oligonucleotides. In one aspect, the methods of the invention are used to prepare phosphitylating reagents using pyridinium salts as activators. In a further aspect, the methods of the invention

The present invention relates to improved methods for the preparation of nucleoside phosphoramidites and oligonucleotides. In one aspect, the methods of the invention are used to prepare phosphitylating reagents using pyridinium salts as activators. In a further aspect, the methods of the invention are used to prepare internucleoside linkages using activators which include at least one pyridinium salt and at least one substituted imidazole. In a further aspect, methods are provided preparation of internucleoside linkages between nucleosides having 2'-substituents using imidazolium or benzimidazolium salts as an activator. In a further aspect, methods are provided preparation of internucleoside linkages between nucleosides having bioreversible protecting group that confers enhanced chemical and biophysical properties, without exocyclic amine protection, using imidazolium or benzimidazolium salts as an activator.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method for preparing a phosphitylated compound comprising the steps of:providing a compound having a hydroxyl group; andreacting said compound with a phosphitylating reagent in the presence of a pyridinum salt in a solvent under conditions of time, temperature and pre

[ What is claimed is:] [1.]1. A method for preparing a phosphitylated compound comprising the steps of:providing a compound having a hydroxyl group; andreacting said compound with a phosphitylating reagent in the presence of a pyridinum salt in a solvent under conditions of time, temperature and pressure effective to yield said phosphitylated compound.