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• W2017112096 endingPage "12721" @default.
• W2017112096 startingPage "12710" @default.
• W2017112096 abstract "Oligodeoxyribonucleotides were synthesized using H-phosphonate monomers without amino protection. The H-phosphonate monomers of deoxyadenosine, deoxycytidine, and deoxyguanosine bearing the free amino groups were synthesized in good yields by O-selective phosphonylation of the parent 5‘-O-(dimethoxytrityl)deoxyribonucleosides. It was found that the amino groups of the nucleosides were not modified during internucleotidic bond formation where (benzotriazol-1-yloxy)carbonium and -phosphonium compounds were employed as condensing reagents. The most effective condensing reagent for rapid internucleotidic bond formation was found to be 2-(benzotriazol-1-yloxy)-1,1-dimethyl-2-pyrrolidin-1-yl-1,3,2-diazaphospholidinium hexafluorophosphate (BOMP). In the present H-phosphonate method, 2-(phenylsulfonyl)-3-(3-nitrophenyl)oxaziridine (PNO) was employed as a new oxidizing reagent for the oxidation of internucleotidic H-phosphonate linkages under anhydrous conditions in the presence of N,O-bis(trimethylsilyl)acetamide. The reaction mechanism for the O-selective condensation was investigated in detail by means of 31P NMR spectroscopy. Unprecedented oxidation of the H-phosphonate monomers was observed during activation of the monomers with (benzotriazol-1-yloxy)phosphonium and -carbonium condensing reagents in the absence of the 5‘-hydroxyl components. A mechanism for the O-selective condensation was proposed on the basis of ab initio molecular orbital calculations for the model compounds at the HF/6-31G* level." @default.
• W2017112096 created "2016-06-24" @default.
• W2017112096 creator A5013306629 @default.
• W2017112096 creator A5020604157 @default.
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• W2017112096 creator A5059943171 @default.
• W2017112096 creator A5087500100 @default.
• W2017112096 date "1997-12-01" @default.
• W2017112096 modified "2023-10-01" @default.
• W2017112096 title "Chemical Synthesis of Oligodeoxyribonucleotides Using <i>N</i>-Unprotected <i>H</i>-Phosphonate Monomers and Carbonium and Phosphonium Condensing Reagents: <i>O</i>-Selective Phosphonylation and Condensation" @default.
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