An improved chemical process for the manufacture of the compound of Formula(I), which is useful, for example, as a late-stage chemical intermediate in the production of osimertinib (AZD9291) and pharmaceutically acceptable salts thereof.本發明提供一種製備式(I)化合物及其醫藥學上可接受之鹽的改良化學方法,該式(I)化合物適用作例如製備奧希替尼(osimertinib)(AZD9291)中的晚期化學中間物。