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Formation of internucleotide 3'-5' phosphoramidate links by direct coupling of phosphoryl and amino groups.

The stepwise synthesis of oligomers derived from 5'-amino-5'-deoxythymidine 3'-phosphate and 5'-amino-5'-deoxy-3'-O-mono-p-methoxytrityl-thymidine is described. The internucleotide phosphoramidate links were formed by condensation of nucleoside 3'-phosphates with aminonucleosides by means of triphenylphosphine and dipridyl disulfide.