3-triazoles based on palladium-catalyzedcarbonylation has been developed. The protocol utilizes readily available 5-iodotriazoles as starting materials. The obtained products were used in the syntheses of fused heterocycles as well as derivatization of the steroidal hormone cortexolone. A regioselective two-step approach to 5-carboxy-1,2,3-triazoles based on palladium-catalyzedcarbonylation has been developed