Oligonucleotide compositions and methods of making the same
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United States of America Patent
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Oct 24, 2017
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app pub date -
Apr 29, 2015
filing date -
May 1, 2014
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Abstract
The present disclosure provides a solid phase method of making oligonucleotides via sequential coupling cycles including at least one coupling of a dinucleotide dimer subunit to a free 3′-terminal group of a growing chain. The oligonucleotides include at least two nucleoside subunits joined by a N3′→P5′ phosphoramidate linkage. The method may include the steps of (a) deprotecting the protected 3′ amino group of a terminal nucleoside attached to a solid phase support, said deprotecting forming a free 3′ amino group; (b) contacting the free 3′ amino group with a 3′-protected amino-dinucleotide-5′-phosphoramidite dimer in the presence of a nucleophilic catalyst to form an internucleoside N3′→P5′ phosphoramidite linkage; and (c) oxidizing (e.g., sulfurizing) the linkage. The compositions produced by the subject methods may include a reduced amount of one or more (N−x) oligonucleotide products. Also provided are pharmaceutical compositions including the subject oligonucleotide compositions.
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