The synthesis of protected 5′-amino2′, 5′-dideoxyribonucleoside-3′-O-phosphoramidites; applications of 5′-amino-oligodeoxyribonucleotides

Abstract
Synthetic routes to the four appropriately protected 5′-amino-2′, 5′-dideoxyribo-nucleoside-3′-O-(2-cyanoethyl N,N-diisopropylphosphoramidites) have been developed. The structures of all intermediates were confirmed by 13 C n.m.r. spectroscopy. These building blocks have been used to prepare 5′-amino-oligodeoxyribonucleotides, which can be coupled to a wide variety of compounds, in particular metal cluster derivatives, but also fluorophores and biotin derivatives, thus generating a variety of very useful probes. Brief mention is made of a tetrairidium cluster derivative of 5′-amino-d[CCGATATCGG], which has been cocrystallised with EcoRV, and will be used for electron microscopy studies.

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