Selective Catalytic Hydrodefluorination as a Key Step for the Synthesis of Hitherto Inaccessible Aminopyridine Derivatives
G. Podolan, D. Lentz, H.-U. Reissig – 2013
Fluorine makes it possible! The regioselective nucleophilic substitution of (oligo)fluoropyridines with the appropriate amines and the subsequent catalytic hydrodefluorination paves the way to hitherto inaccessible aminopyridine derivatives, which are of interest as new ligands. Up to four fluorine atoms can be removed regioselectively in one step in a reaction employing an inexpensive titanium precatalyst.