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Zhang, Zi‐Jing; Zhang, Ling; Geng, Rui‐Long; Song, Jin; Chen, Xiao‐Hua; Gong, Liu‐Zhu
Angewandte Chemie International Edition, August 26, 2019, Volume: 58, Issue: 35Journal Article
Highly enantioselective 3+3 and 3+4 annulations of isatin‐derived enals with ethynylethylene carbonates and ethynyl benzoxazinanones are enabled by NHC/cooper cooperative catalysis, leading to a big library of spirooxindole derivatives in high structural diversity and enantioselectivity (up to 99 % ee). Both reactions represent a nicely synergistic integration of NHC and copper catalysis, in which both catalysts activate the substrates and the chiral NHC perfectly controls the stereochemistry. All together now: A cooperative N‐heterocyclic carbene (NHC)/cooper catalytic system was developed for the diversity‐oriented synthesis of spirooxindole derivatives through enantioselective 3+3 and 3+4 annulation reactions. Highly enantioselective 3+3 and 3+4 annulations of isatin‐derived enals with ethynylethylene carbonates and ethynyl benzoxazinanones were achieved.
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