Tian-Yu Liu, Hai-Lei Cui, Jun Long, Bang-Jing Li, Yong Wu, Li-Sheng Ding, Ying-Chun Chen,
Organocatalytic and Highly Stereoselective Direct Vinylogous Mannich Reaction Journal of the American Chemical Society. ,vol. 129, pp. 1878- 1879 ,(2007) ,
10.1021/JA068703P