This study involves the preparations of some pyridine derivatives starting from Isonicotinic acid (1) following these steps :First : The Synthesis of Isonicotinoyl acid chloride (2) by The reaction of Isonicotinic acid (1) and thionylchloride .Second : The Synthesis of some amide and ester derivatives by reaction between Isonicotinoyl acid chloride (2) and substituent amine or phenol derivatives ( Semicarbazide, Thiosemicarbazide, Benzohydrazide, Aniline, 4-phenylazoaniline, 4-phenylazophenol, p-Aminophenol, p-Aminoacetophenone, m-Toluidine, 4-Bromoaniline )