The application relates to the technical field of medicines, in particular to a preparation process of a Tucatinib intermediate 4-([1,2,4]triazolo[1,5-a]pyridin-7-yloxy)-3-
methylaniline, which comprises the following steps: step 1: under a
nitrogen atmosphere, a
substitution reaction is carried out on a compound B and a
compound C in a base and an
organic solvent system to obtain a compound D; step 2: the compound D is added into a reduction catalytic
solution system protected by
nitrogen, after 8-30h of reaction at 70-120 DEG C, TLC tracking is carried out until the reaction is completed, 2-8 times the volume of the compound D is added into water, post-treatment and purification are carried out, and the
compound A is obtained; wherein the reduction catalytic
solution system comprises a
reducing agent, a catalyst and an inorganic acid, the
reducing agent comprises a reducing
phosphoric acid, and the catalyst comprises
iodine or a
metal salt of
iodine. The preparation process of the Tucatinib intermediate 4-([1,2,4]triazolo[1,5-a]pyridin-7-yloxy)-3-
methylaniline in the application has mild
reaction conditions, high product yield and high purity, the preparation process is environment-friendly, and can be used for industrial production.