Objective:To improve the existing synthesis process of Tazemetostat.Methods:The target compound Tazemetostat was obtained from methyl 3-amino-5-bromo-2-methylbenzoate by a 5-step reaction with two reductive amination reactions,Suzuki coupling,hydrolysis and condensation.Results and conclusions:The target compound was confirmed by 1H-NMR and LC-MS in 57.6%yield(based on methyl 3-amino-5-bromo-2-methylbenzoate)and 99.1%purity(HPLC method).The method has simple operation,no column chromatography operation,high yield and high puri...