A new synthetic method for the preparation of nucleoside phosphoramidate analogues with the nitrogen atom in bridging positions of the phosphoramidate linkage
作者:Inger Kers、Jacek Stawiński、Adam Kraszewski
DOI:10.1016/s0040-4039(97)10734-1
日期:1998.3
An efficient method for the preparation of nucleoside P3′→N5′ and N3′→P5′ phosphoramidates and their thio analogues results from generation of a pyridine adduct of a nucleoside metaphosphate or its analogue from a nucleosideH-phosphonate, nucleoside H-phosphonothioate or nucleoside H-phosphonodithioate monoester followed by its reaction with 5′- or 3′-aminonucleoside.
The Case for the Intermediacy of Monomeric Metaphosphate Analogues during Oxidation of <i>H</i>-Phosphonothioate, <i>H</i>-Phosphonodithioate, and <i>H</i>-Phosphonoselenoate Monoesters: Mechanistic and Synthetic Studies
Studies on the reaction of H-phosphonothioate, H-phosphonodithioate, and H-phosphonoselenoate monoesters with iodine in the presence of a base led to identification of a unique oxidation pathway, which consists of the initial oxidation of the sulfur or selenium atom in these compounds, followed by oxidative elimination of hydrogen iodide to generate the corresponding metaphosphate analogues. The intermediacy
Nucleoside phosphoramidates and their analogues with the P-N bond in bridging positions of the phosphoramidate linkage were prepared by a new method utilizing the corresponding pyridine adducts of metaphosphates. Also, a new procedure was developed for the synthesis of unprotected nucleoside phosphoromono- and phosphorodithioates.