Abstract
[formula: see text] A method for a large-scale synthesis of stereodefined oligo(nucleoside 3',5'-methanephosphonates) has been developed, based on transient 3'-O protection, which allows for the conversion of the protecting chirally defined methanephosphonanilidate group, located at the 3' end of a stereoregular oligomer, into diastereomerically pure oligomeric building blocks for stereospecific coupling with the 5'-OH group of another oligonucleotide.
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