The invention discloses a 3-
aryl coumarin derivative as well as a preparation method and application thereof, and the preparation method comprises the following steps: reacting substituted 2-bromobenzaldehyde with a substituted
aryl acetic acid compound to obtain a substituted E-2, 3-diaryl
acrylic acid compound; and in the presence of cuprous
oxide and
potassium carbonate, heating and reacting in N, N-
dimethylformamide to obtain the 3-
aryl coumarin derivative. The 3-aryl
coumarin derivative disclosed by the invention can be combined with BRD4, has remarkable inhibitory activity on the BRD4, has a protective effect on primary myocardial cells caused by
ischemia reperfusion, can inhibit proliferation, migration and invasion of cardiac fibroblasts, and can inhibit
ferroptosis of hypoxia /
reperfusion injury myocardial cells; the compound can be used for preparing medicines for treating diseases related to abnormal BRD4 activity.