Some Chemical and Stereochemical Aspects of Ribonucleoside H-Phosphonate and H-Phosphonothioate Diester Synthesis

Abstract
Some chemical and stereochemical aspects of condensation of ribonucleoside 3′-H-phosphonates, 3′-H-phosphonomonothioates and 3′4%-phosphonodithioates into the corresponding diesters 4 and 5 together with oxidation and sulfurization of the latter ones, are discussed.