Individual isomers of dinucleoside boranophosphates as synthons for incorporation into oligonucleotides: Synthesis and configurational assignment

Individual isomers of the protected boranophosphates 5a and 5b, i.e., the N6-benzyl-2'-deoxy-5'-O-(4,4'dimethoxytrityl)adenosin-3'-yl 2'-deoxy-4- O-(4-nitrophenyl)uridin-5'-yl boranophosphates, were synthesized via stereospecific silylation and boronation of their H-phosphonate precursors. 2D-NMR Spectroscopic studies yielded an initial assignment of the isomer configuration, which was further confirmed unambiguously by a parallel chemical synthesis. Deprotection of the 'dimers' 5a and 5b yielded the individual [P(R)]- and [P(S)]-isomers 7a and 7b, respectively, i.e., the 2'- deoxyadenosin-3'-yl 2'-deoxycytidin-5'-yl boranophosphates. Their substrate properties toward phosphodiesterase I were identical to those of the previously characterized isomers of dithymidine boranophosphate. The protected 'dimers' 5a and 5b can be used as synthons to incorporate the boranophosphate linkage with a defined configuration to selected positions of an oligonucleotide chain.

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Author Barbara R. Shaw Chemistry