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• W2053276598 abstract "A few different methods for the preparation of oligonucleotide N-alkylphosphoramidates were compared directly. One of these, involving the use of protected nucleoside phosphites as building blocks, provided the requisite N-alkylphosphoramidates via oxidation of the intermediate dinucleoside methyl phosphites with iodine in the presence of the appropriate alkylamine. This method was found to have several attractive features, including the use of building blocks identical with those employed for the synthesis of DNA and compatibility with procedures and instruments employed for the stepwise synthesis of oligonucleotides by solution and solid-phase methods. This procedure was used to make several di-, tri-, and tetranucleotide N-alkylphosphoramidates derived from deoxyadenosine and thymidine; alkyl substituents included N,N-dimethyl, N-butyl, N-octyl, N-dodecyl, and N-(5-aminopentyl). The aminoalkyl derivative of d(TpT) (24) was used to demonstrate the feasibility of introducing an intercalative agent to the alkylphosphoramidate moiety of such derivatives. The oligonucleotide N-alkylphosphoramidates were separated into their component diastereomers and characterized structurally by a number of techniques including circular dichroism, high-field 1H NMR spectroscopy, FAB mass spectrometry, and enzymatic digestion to authentic nucleosides and nucleotides. Physicochemical characterization of several di- and trinucleotide alkyl-phosphoramidates revealed that the adenine nucleotide analogues formed stable complexes with poly-(thymidylic acid). The stabilities of these complexes were found to increase with increasing chain length of the N-alkylphosphoramidate substituents. The finding that N-alkylphosphoramidate substituents can enhance the binding of certain oligonucleotides to their complementary polynucleotides suggests the existence of a novel source of polynucleotide affinity." @default.
• W2053276598 created "2016-06-24" @default.
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• W2053276598 date "1988-09-01" @default.
• W2053276598 modified "2023-10-14" @default.
• W2053276598 title "Oligonucleotide N-alkylphosphoramidates: synthesis and binding to polynucleotides" @default.
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• W2053276598 doi "https://doi.org/10.1021/bi00419a010" @default.
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