Gu, X., Guo, T., Dai, Y., Franchino, A., Fei, J., Zou, C., …Ye∗, J. (2015). Direct catalytic asymmetric doubly vinylogous Michael addition of α,β-unsaturated γ-butyrolactams to dienones. Angewandte Chemie International Edition, 54, https://doi.org/10.1002/anie.201504276