An efficient gold‐catalyzed oxidation/1,2‐ heteroaryl migration cascade leading to 2‐heteroaryl‐substituted 1,3‐diketones and its further application in the one‐pot synthesis of 4‐heteroaryl‐substituted pyrazoles and the preparation of 4‐heteroaryl‐substituted isoxazoles are reported. A wide variety of 4‐heteroaryl‐substituted pyrazoles were obtained, indicating the broad substrate scope and functional