Abstract
Abstract Two kinds of substituted trityls, i.e., 4,4′,4″-tris(benzoyloxy)trityl (TBTr) and 4,4′,4″-tris(p-anisoyloxy)trityl (TAnTr), have been examined as protecting groups of the amino group of adenosine in oligoribonucleotide synthesis. The former was used for a 3′-terminal adenosine unit and the latter was introduced into an building block of internal adenosine. These protecting groups were successfully applied to the liquid-phase synthesis of pGUA and pGUAUUA which were the 5′-terminal oligoribonucleotide fragments of brome mosaic virus mRNA 4.
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