Progress in Palladium-Catalyzed Tandem Reaction of Constructing Benzo-Five-Membered Heterocycles

The benzo-five-membered heterocycles existed extensively in many important natural products and also showed excellent bioactivites.Therefore, organic chemists around the world made efforts to develop the highly efficient methods of constructing these heterocycles.Recently, the syntheses of them via transition metal-catalyzed tandem reaction, especially palladium-catalyzed reaction, have been reported widely.This review emphasizes on the palladium-catalyzed tandem reaction of the formation of benzo-five-membered heterocycles and their derivatives reported since 2000.