Synthesis of Novel Fluorinated Bisphosphonates and Bisphosphonic Acids
摘要:
The synthesis of novel fluorinated bisphosphonates with two, three, four, and six difluoromethylene groups (1a, 1b, 8, 12, and 15) (44-78%) by different approaches is described. The bisphosphonates were converted to the corresponding trimethylsilyl esters which on treatment with deionized water afforded the respective bisphosphonic acids (6, 10, and 14) in good yields.
The free radical addition of phosphonodifluoromethyl radical is reported from iodophosphonate and sodium dithionite, triethylborane, or dilauroyl peroxide as initiator. Triethylborane promoted the radical conjugated addition onto enones.
Fluorophosphonylated Nucleoside Derivatives as New Series of Thymidine Phosphorylase Multisubstrate Inhibitors
作者:Sonia Amel Diab、Coralie De Schutter、Murielle Muzard、Richard Plantier-Royon、Emmanuel Pfund、Thierry Lequeux
DOI:10.1021/jm201694y
日期:2012.3.22
The synthesis of new class of potential TPase inhibitors containing a difluoromethylphosphonate function as phosphate mimic is reported. This newseries was prepared from a readily available fluorinated building block in few steps. Two series were evaluated as potential inhibitors: a linear series and a conformationalconstrainedseries. The activity of these multisubstrate inhibitors depends on the
Radical conjugate addition of ambiphilic fluorinated free radicals
作者:Coralie De Schutter、Emmanuel Pfund、Thierry Lequeux
DOI:10.1016/j.tet.2013.05.006
日期:2013.7
character of fluorinated radicals was noticed during their radicalconjugate addition onto electron-deficient alkenes. Freeradicals were trapped with enones when the reaction was conducted from iododifluoro-acetate and -phosphonate derivatives in the presence of Et3B. Competitive addition reaction onto electron-rich or -deficient alkenes was observed depending on the freeradical initiator.
as starting chemicals. To circumvent this limitation, we report the preparation of a thioether as a new source of the lithiodifluoromethylphosphonate. This methodology avoiding the use of HCFCs involves a selective fluorination of sulfide followed by a thiaphilic addition of an organometallic reagent, which offers an alternative route to obtain phosphonodifluoromethyl carbanion. A contrasted reactivity
The first synthesis of oligonucleotides incorporating URF, a uridine modified with a difluorophosphonylated allylic ether onto the 2′-position, is described. Fluorinated homouridylates and miR-342-3p analogues are efficiently prepared. UV-melting experiments and enzymatic degradation studies indicate this new series of fluorinated oligonucleotides exhibit good and thermal metabolic stability as well