RNA SYNTHESIS - PHOSPHORAMIDITES FOR SYNTHETIC RNA IN THE REVERSE DIRECTION, AND APPLICATION IN CONVENIENT INTRODUCTION OF LIGANDS, CHROMOPHORES AND MODIFICATIONS OF SYNTHETIC RNA AT THE 3' - END

摘要

The present invention relates to novel phosphoramidites, A-n-bz, C-n-bz, C-n-ac, G-n-ac and U are produced with an HPLC purity of greater than 98% and 31P NMR purity greater than 99%. A novel process of reverse 5′→3′ directed synthesis of RNA oligomers has been developed and disclosed. Using that method demonstrated high quality RNA synthesis with coupling efficiency approaching 99%.