Chemical synthesis of nucleoside H-boranophosphonates and their application as precursors of P-modified nucleotide analogues

Abstract

Nucleoside H-boranophosphonates were synthesized via the condensation reactions of appropriately protected nucleosides with monopyridinium H-boranophosphonate and subsequent deprotection under basic conditions. 3',5'-O-Protected dinucleoside H-boranophosphonates were also synthesized via the condensation of the corresponding 5'-O-protected nucleoside 3'-H-boranophosphonates with 3'-O-protected nucleosides. A study on the chemical properties of the resultant dinucleoside phosphate analogues revealed that the P-H group could be further modified under anhydrous basic conditions.