Methyl 2-amino-5-cyano-3-(difluoromethyl)pyridine-4-carboxylate
Methyl 2-amino-5-chloro-3-(difluoromethyl)pyridine-6-carboxylate
Methyl 2-amino-4-chloro-6-(difluoromethyl)pyridine-3-carboxylate
Ethyl 2-amino-3-cyano-4-(difluoromethyl)pyridine-6-acetate