Citation:
Yuan-Qin Zheng, Chun-Feng Luan, Zhi-Jing Wang, Yong-Qi Yao, Zhi-Chuan Shi, Xue-Feng Li, Zhi-Gang Zhao, Feng Chen. Enantioselective synthesis of 2-amino-3-nitrile-chromenes catalyzed by cinchona alkaloids:A remarkable additive effect[J]. Chinese Chemical Letters,
;2016, 27(01): 25-30.
doi:
10.1016/j.cclet.2015.08.013
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2-Amino-3-nitrile-chromenes with potential antitumor activity were constructed by a novel catalytic system. In combination with α-naphthol, quinine could effectively promote the Michael-cyclization process of malononitrile with functionalized chalcones in high yields and moderate to good enantioselectivity(up to 84% ee). It is notable that the enantioselectivity could be greatly improved when α-naphthol was employed as additive.
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