Abstract
A protocol for the straightforward preparation of small circular oligodeoxyribonucleotides (2-28 nt) is reported. The assembly of the oligonucleotide chain (standard phosphoramidite chemistry) and cyclization by the phosphotriester method take place on a tailor-made nucleotide-derivatized solid support. Although cyclization yields are moderate, the procedure exploits a synthesis design that allows selective cleavage of the circular oligonucleotide from the support, which facilitates isolation of the target molecule by simple filtration.
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