Abstract
A hexanucleotide pC-A-A-C-C-Ap, which corresponds to the 3''-end of [Escherichia coli] tRNAfMet, was synthesized as a bisphosphorylated form, which should be a suitable donor substrate for joining with RNA ligase. 3''-Phosphorylated oligonucleotides were condensed by a triester method and the 5''-terminus of the protected hexanucleotide was phosphorylated with dianilidophosphorochloridate after demonomethoxytritylation. A site-directed base transition mutant sequence C-G-A-C-C-Ap was also synthesized by the triester method using suitably protected 3''-phosphorylated oligonucleotides.

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