PROBLEM TO BE SOLVED: To provide processes for the preparation of PI3K inhibitor, GDC-0032.SOLUTION: The present invention provides GDC-0032 shown below, and intermediates useful for the preparation of the same.SELECTED DRAWING: NoneCOPYRIGHT: (C)2019,JPO&INPIT【課題】PI3K阻害化合物GDC-0032の作製方法を提供する。【解決手段】下記のGDC-0032、及びこれを調製するために有用な中間体の調製方法。【選択図】なし