作者:Yu Chu Yang、Linda L. Szafraniec、William T. Beaudry、Clifford A. Bunton
DOI:10.1021/jo00077a011
日期:1993.12
The exceedingly toxic nerve agent VX (O-ethyl S-(2-diisopropylamino(ethyl methylphosphonothioate) cannot be detoxified by reaction with hydroxide ion but is rapidly detoxified by perhydrolysis (substitution with HO2-) presumably via an intramolecular oxygen transfer which precludes loss of the ethoxy group.
Bioreversible protection for the phospho group: chemical stability and bioactivation of di(4-acetoxybenzyl) methylphosphonate with carboxyesterase
作者:Sally Freeman、William J. Irwin、Antony G. Mitchell、Dave Nicholls、William Thomson
DOI:10.1039/c39910000875
日期:——
In contrast to high chemical stability (t1/2 55.4 h at 36.4 °C), with porcine liver Carboxyesterase the title compound 1 spontaneously decomposes first to the monoester 2 then to methylphosphonate, both reactions proceeding via the 4-hydroxybenzyl intermediates 3 and 4.
Preparation of oligodeoxyribonucleoside alkyl or arylphosphonates
申请人:The Johns Hopkins University
公开号:US04507433A1
公开(公告)日:1985-03-26
Process for synthesizing deoxyribonucleoside methylphosphonates on polystyrene polymer supports which involves condensing 5'-dimethoxytrityldeoxynucleoside 3'-methylphosphonates. The oligomers are removed from the support and the base protecting groups hydrolyzed by treatment with ethylenediamene in ethanol, which avoids hydrolysis of the methylphosphonate linkages. Two types of oligomers are synthesized: those containing only methylphosphonate linkages, d-Np(Np).sub.n N, and those which terminate with a 5' nucleotide residue, dNp(Np).sub.n N. The latter oligomers can be phosphorylated by polynucleotide kinase, and are separated by polyacrylamide gel electrophoresis according to their chain length. Piperidine randomly cleaves the oligomer methylphosphonate linkages and generates a series of shorter oligomers whose number corresponds to the length of the original oligomer. Apurinic sites introduced by acid treatment spontaneously hydrolyze to give oligomers which terminate with free 3' and 5'-OH groups. These reactions may be used to characterize the oligomers.