Highly Enantioselective Michael Addition Catalyzed by New Primary Amine-Squaramide Organocatalysts
Ma Zhiwei, Liu Xiaofeng, Liu Juntao, Tao Jingchao
Chin. J. Org. Chem. . 2018, (1): 183 -189 .  DOI: 10.6023/cjoc201706025