Abstract
Four fully base protected phosphodiester building blocks have been synthesised and fully characterised. The phosphate protecting group used was the 2-(1-methylimidazol-2-yl)phenyl group, enabling intramolecular catalysis of the condensation step in oligodeoxyribonucleotide synthesis by the solid phase phosphotriester method. Cycle times of about 12 min could thus be achieved. Moreover, the used of extra protecting groups on deoxythymidine and 2'-deoxyguanosine resulted in much cleaner oligodeoxyribonucleotides as evidenced by ion-exchange and reversed phase h.p.l.c.
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