Catalytic Asymmetric [4 + 2] Cycloadditions and Hosomi–Sakurai Reactions of α-Alkylidene β-Keto Imides

Kohei Orimoto , Harufumi Oyama , Yuki Namera ,Takashi Niwa , and Masahisa Nakada 

Org. Lett., 2013, 15 (4), pp 768–771

DOI: 10.1021/ol303381c