Abstract

Stereodefined dinucleoside boranophosphates were synthesized from diastereopure nucleoside 3'-oxazaphospholidine derivatives. The new method is based on the stereospecific formation of dinucleoside phosphite intermediates catalyzed by a non-nucleophilic acidic activator, N-(cyanomethyl)pyrrolidinium triflate, and the boronation of the intermediates.

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