Palladium-Catalyzed Intramolecular [4+2] Cycloadition Reactions of Aryl-Substituted Diynes
Wu Yuqin, Yang Yong, Li Lidong
Chin. J. Org. Chem. . 2015, (11): 2333 -2339 .  DOI: 10.6023/cjoc201505032