[An azidomethyl protective group in the synthesis of oligoribonucleotides by the phosphotriester method].

A rapid and effective method of an automatic oligoribonucleotide synthesis alternative to the phosphoroamidite one was developed based on the phosphotriester approach of internucleotide bond formation under intramolecular O-nucleophilic catalysis and the use of an azidomethyl group for protection of a nucleotide 2'-hydroxyl function.