Synthesizing method for a 3-substituted-3-oxo-2-(2,4-oxazolidinedione-3-yl) propionic acid amide compound

A synthesizing method for obtaining a 3-substituted-3-oxo-2-(2,4-oxazolidinedione-3-yl)propionic acid amide compound represented by the following Formula [I], by reacting a compound represented by the following Formula [II] with a compound represented by the following Formula [III], in the presence of an organic base;

• wherein, R1 represents an alkyl group, a cycloalkyl group, an aryl group, an amino group or a heterocyclic group;
• R2 represents a chlorine atom, an alkoxy group or an aryloxy group;
• R3 represents a substituent group;
• n represents an integer of 0 to 4;
• when n represents an integer of at least 2, plural R3 may be the same or different;
• R4 and R5 each represent a hydrogen atom, an alkyl group or an aryl group;
• while X represents a chlorine atom or a bromine atom.