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.
Ring-opening reactions of functionalized 1,2-cyclic sulfates and oxetanes with the phosphonodifluoromethyl carbanion are reported. This approach allows an easy access to fluorinated beta-hydroxyphosphonates that are building blocks in the synthesis of acyclic nucleosides. Synthesis of precursors of nucleoside phosphorylase inhibitors from these alcohols is described.
Preparation of several acyclonucleosides containing both a difluoromethylphosphonate group and a triazole moiety is described starting from a difluorophosphonosulfide. The key step of the synthesis involves a copper(I)-catalyzed Huisgen 1-3 dipolar cycloaddition between difluorophosphonylated azides and propargylated nucleobases derived from thymine and 2-amino-6-chloropurine.
Fluorophosphonylated Monomers for Dental Applications
作者:Mathieu Derbanne、Anais Zulauf、Stéphane Le Goff、Emmanuel Pfund、Michaël Sadoun、Thi-Nhàn Pham、Thierry Lequeux
DOI:10.1021/op500108m
日期:2014.8.15
The synthesis of acrylate derivatives bearing a difluorophosphonic acid function has been realized by ring-opening reaction of oxac-ycles and alkylation of fluorinated carbanions. Their use in self-etch adhesives is reported. The resulting adhesives based on difluorophosphonic acid monomers provide significantly higher dentin shear bond strength (SBS) than the one based on phosphonic acid, mainly due to the presence of fluorine atoms.
Sulfanyl- and Selanyldifluoromethylphosphonates as a Source of Phosphonodifluoromethyl Radicals and Their Addition onto Alkenes
作者:Thierry Lequeux、Fanny Lebouc、Chrystel Lopin、Hongli Yang、Géraldine Gouhier、Serge R. Piettre
DOI:10.1021/ol006746j
日期:2001.1.1
[GRAPHICS]Two different strategies are shown to produce sulfanyl and selanyldifluoromethylphosphonates, Thus, treatment of sulfanyldichloromethylphosphonates by 3HF . NEt3 in the presence of zinc bromide produces the corresponding sulfanyldifluoromethylphosphonates. In addition, lithiation of difluoromethylphosphonates followed by quenching with phenylsulfanyl chloride, phenylselanyl chloride, or diphenyl diselenide yields the corresponding sulfanyl- and selanyldifluorophosphonates. Generation of phosphonodifluoromethyl radicals from such precursors in the presence of alkenes produces the expected adducts.