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Deoxynucleoside phosphoramidites can be prepared in good yield from deoxynucleosides, bis- dialkylaminophosphines , and the corresponding dialkylamine hydrotetrazolide or tetrazole as catalysts. These phosphoramidites generated in situ lead to the direct synthesis of deoxyoligonucleotides on polymer supports.
Barone et al. (Sun,) studied this question.