PROBLEM TO BE SOLVED: To provide an improved process for preparation of dihydropteridinone.SOLUTION: The process for preparation of a dihydropteridinone derivative is illustrated by the reaction example.COPYRIGHT: (C)2013,JPO&INPIT【課題】ジヒドロプテリジノンの改良された調製方法の提供。【解決手段】以下の反応例で例示されるジヒドロプテリジノン誘導体の調整法【選択図】なし