PRODUCTION METHOD OF INTERMEDIATE COMPOUND FOR SYNTHESIZING MEDICAMENT

The present invention relates to a process for preparing a compound of formula 2 that is an intermediate used to synthesize a dipeptidyl peptidase IV enzyme-inhibiting therapeutic agent for treating diabetes mellitus, which (1) can be produced in high purity through an oxazolidinone cyclization reaction and a decyclization reaction of converting the same into amide, (2) can lead to an increase in yield and productivity through stabilization of a production process, and (3) can achieve an improved effect, such as reduction of raw material costs, by using an inexpensive material as a starting material.