| abstract |
(57) [Problem] To produce an isoxazolidinedione compound, an intermediate thereof and a salt thereof in a high yield and industrially feasible. A compound useful as a therapeutic agent for diabetes [11] (Wherein, R is an optionally substituted aromatic hydrocarbon group, an optionally substituted cycloaliphatic hydrocarbon group, an optionally substituted heterocyclic group or an optionally substituted fused heterocyclic group. ) Wherein the particularly important intermediate is represented by the general formula [3]: (Wherein R is as defined above), wherein the aspartate derivative represented by the formula In addition, an industrially practicable method is provided. |