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Synthetic routes to the four appropriately protected 5'-amino-2',5'-dideoxyribonucleoside-3'-O-(2-cyanoethyl N,N-diisopropylphosphoramidites) have been developed. The structures of all intermediates were confirmed by 13C 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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