Abstract
Dialkyl(cyanomethyl)ammonium salts 1 were synthesized and used as a novel class of activators for the stereospecific condensations of diastereopure nucleoside 3′-O-oxazaphospholidines with a nucleoside. This new oxazaphospholidine method could efficiently produce both (Rp)- and (Sp)-dinucleoside phosphorothioates.
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