To a stirred solution of p-toluenesulfonhydrazide (0.61g, 3.3 mmol) in methanol/water (6:4, 20 ml) at 60°C was added 2-cinnamyl-1,3-oxazole-4-carboxaldehyde [1](0.50 g, 2.5 mmol). The solution was cooled to room temperature and stored in the refrigerator overnight. The precipitate which formed was collected by filtration and washed with methanol/water mixture (6:4, 10 mL) to give 2-cinnamyl-1,3-oxazole-4-carboxaldehyde p-toluenesulfonyl hydrazone as a colorless solid (0.66 g, 72%).