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1Enantioselective synthesis of 2-amino-3-nitrile-chromenes catalyzed by cinchona alkaloids:A remarkable additive effect显示文摘2-Amino-3-nitrile-chromenes with potential antitumor activity were constructed by a novel catalytic system. In combination with a-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 a-naphthol was employed as additive.Yuan-Qin Zheng Chun-Feng Luan Zhi-Jing Wang Yong-Qi Yao Zhi-Chuan Shi Xue-Feng Li Zhi-Gang Zhao Feng Chen 2016Chinese Chemical Letters2016,27,1:0
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