Preparation method for 4-(4-aminophenyl)morpholine-3-one

The invention relates to a preparation method of a Rivaroxaban intermediate compound 4-(4-aminophenyl)morpholine-3-one shown as formula I. The preparation method is carried out according to the following route. The method has the advantages of safe operation, easily available raw materials, low cost, little pollution, and is suitable for large-scale industrial production. (preparation route). Specifically, X is a leaving group and is taken from halogen, R1C(O)O acyloxy and R2S(O2)O sulfonyloxy, wherein R1 is taken from C1-8 alkyl, trifluoromethyl or aryl, and R2 is taken from C1-8 alkyl, C1-6 fluoroalkyl and aryl.