A rapid and convenient synthesis of poly-thymidylic acid by the modified triester approach - PubMed (original) (raw)
A rapid and convenient synthesis of poly-thymidylic acid by the modified triester approach
A K Sood et al. Nucleic Acids Res. 1977 Aug.
Free PMC article
Abstract
By using anhydrous triethylamine-pyridine to selectively remove the cyanoethyl group from the fully protected oligonucleotide, a substantial improvement has been achieved in yields and the rates of condensation by the modified triester approach from the 5' leads to 3' end. The unreacted oligonucleotide containing the 5'-hydroxy group was removed by treatment with bis (triazolyl)-p-chlorophenyl phosphate after each condensation in situ. These modifications, as exemplified by the synthesis of fully protected T12, T18, T24 and T38 in 80%, 77%, 70% and 50% yields respectively, should allow the ready synthesis of polynucleotides of even longer chain lengths by purely chemical methods.
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