A method for preparing 2-aminopyridine derivatives, which comprises substituting of fluorine for hydrazine moiety and reducing with hydrogen using 3-substituted-2,5,6-trifluoropyridine as a starting material, provides 2-aminopyridine derivatives having a purity over 98% under a mild reaction condition.
Removal of Fluorine from and Introduction of Fluorine into Polyhalopyridines: An Exercise in Nucleophilic Hetarenic Substitution
作者:Carla Bobbio、Thierry Rausis、Manfred Schlosser
DOI:10.1002/chem.200400837
日期:2005.3.4
Starting fromsix industrially available fluorinated pyridines, an expedient access to all three tetrafluoropyridines (2-4), allsix trifluoropyridines (5-10), and the five non-commercial difluoropyridines (11-14 and 16) was developed. The methods employed for the selective removal of fluorinefrom polyfluoropyridines were the reduction by metals or complex hydrides and the site-selective replacement