The title compound was synthesized in 77.3% yield (98.3% HPLC) from 2-aminoacetophenone.By studying of reaction temperature, time, ratio of reactants, obtained the optimal conditions as: temperature = 10 ∼ 15°C, time = 20h, n(3) : n(4) : n(HCl) = 1.0 : 1.1 : 3.0.