The Chemical Synthesis of Biochemically Active Oligoribonucleotides Using Dimethylaminomethylene Protected Purine H-Phosphonates |
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Authors: | Gunther Ott Lubos Arnold Jiri Smrt Michal Sobkowski Stefan Limmer Hans-Peter Hofmann |
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Institution: | 1. Laboratorium für Biochemie, Universit?t Bayreuth , 95440, Bayreuth, FRG;2. Institute of Organic Chemistry and Biochemistry, Academy of Sciences of Czech Republic , CZ-16610, Prague, Czech Republic;3. Institute of Bioorganic Chemistry, Polish Academy of Science , PL-61-704, Poznan, Poland |
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Abstract: | Abstract Dimethylaminomethylene was applied as the protecting group for the exocyclic amino groups of adenosine and guanosine in the automated chemical synthesis of oligoribonucleotides on a polymer bound support. The dimethyl-aminomethylene protecting group can be removed at room temperature under conditions where the concomitant loss of the 2′-protection group can be excluded. The transformation of 2′-O-(t-butyldimethylsilyl)-5′-O-(4,4′-dimethoxytrityl) protected nucleosides to 3′-H-phosphonates yields synthons, well suited for the automated chemical synthesis of oligoribonucleotides. Using these H-phosphonate monomers, a coupling time of two minute: is sufficient to obtain average coupling yields of more than 98 %. Synthesized RNA is recognized as a substrate in an enzymatic reaction, forms the expected secondary structures and is suitable for NMR structural investigations. |
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