(EN) Novel 2- and 4-substituted pyrimidine nucleosides and oligonucleosides are provided, as are methods and intermediates useful in preparing same.(FR) De nouveaux oligonucléosides et nucléosides pyrimidiques substitués en position 2 et 4 sont décrits, ainsi que des procédés et des intermédiaires destinés à leur préparation.
[EN] PHOSPHORAMIDITES FOR SYNTHETIC RNA IN THE REVERSE DIRECTION<br/>[FR] PHOSPHORAMIDITES POUR ARN SYNTHÉTIQUE EN SENS INVERSE
申请人:CHEMGENES CORP
公开号:WO2011103468A2
公开(公告)日:2011-08-25
The present invention provides building blocks and methods for synthesizing very pure RNA in a form that can efficiently be modified at the 3' end. Reverse RNA monomer phosphoramidites have been developed for RNA synthesis in 5'-> 3' direction, leading to very clean oligo synthesis that allows for the introduction of various modifications at the 3 '-end cleanly and efficiently. Higher coupling efficiency per step have been observed during automated oligo synthesis with the reverse RNA amidites disclosed herein, resulting in a greater ability to achieve higher purity and produce very long oligonucleotides. The use of the reverse RNA phosphoramidites in the synthetic process of this invention leads to oligonucleotides free of N+1 species.