Base-Pairing Systems Related to TNA: α-Threofuranosyl Oligonucleotides Containing Phosphoramidate Linkages1

Abstract
(3‘NH)- and (2‘NH)-TNA, two isomeric phosphoramidate analogues of TNA (α-threofuranosyl-(3‘→2‘) oligonucleotides), are shown to be efficient Watson−Crick base-pairing systems and to undergo intersystem cross-pairing with TNA, RNA, and DNA.