Ethyl 4-amino-3-(chloromethyl)-2-(difluoromethyl)pyridine-6-carboxylate
Methyl 4-amino-3-(bromomethyl)-5-(difluoromethyl)pyridine-2-carboxylate
Ethyl 3-amino-2-(bromomethyl)-6-(difluoromethyl)pyridine-4-carboxylate
Ethyl 3-amino-2-(bromomethyl)-4-(difluoromethyl)pyridine-6-carboxylate