Phosphine-Catalyzed Formal[6+2] Cycloadditions of α'-Methylene 2-Cyclopentenones
Shi Chonghui, Xiao Benxian, Du Wei, Chen Yingchun
Chin. J. Org. Chem. . 2019, (8): 2218 -2225 .  DOI: 10.6023/cjoc201903061