Mild Addition of Nucleophiles to Pyridine-<i>N</i>-Oxides
作者:Allyn T. Londregan、Sandra Jennings、Liuqing Wei
DOI:10.1021/ol200352g
日期:2011.4.1
A general and facile one-pot procedure for the synthesis of 2-substituted pyridines from the corresponding pyridine-N-oxides and nucleophiles is presented as a mild alternative to SNAr chemistry. A variety of nucleophiles and heterocyclic-N-oxides participate effectively in this transformation, which uses the phosphonium salt, PyBroP, as a means of substrate activation.
To find effective antiprioncompounds, we synthesized and evaluated various pyrazolonederivatives. Seven of 19 compounds showed inhibition of PrP-res accumulation and the remarkably active compound 13 showed an IC50 value of 3 nM in both ScN2a and F3 cell lines. Findings from studies on physicochemical and biochemical properties suggest that the action mechanism of these compounds does not correlate