Honghong Wang, Fan Gong, Ping Xue, Helin Lu, Xiaobo Wang, Jun Gong
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Ni(OTf)2-Catalyzed Michael Addition Reactions of 4-Hydroxycoumarins to α,β-Unsaturated 2-Acyl Imidazoles
An efficient Michael addition of 4-hydroxycoumarins to α,β-unsaturated 2-acyl imidazoles catalyzed by Ni(OTf)2 as a Lewis acid has been developed. A series of 4-hydroxycoumarin derivatives were obtained in excellent yields (up to 96%) with a 2 mol% catalyst loading under mild conditions. Additionally, when a chiral-at-metal rhodium complex was used as the catalyst, moderate enantioselectivity was observed (74% ee).
期刊介绍：
SYNLETT is an international journal reporting research results and current trends in chemical synthesis in short personalized reviews and preliminary communications. It covers all fields of scientific endeavor that involve organic synthesis, including catalysis, organometallic, medicinal, biological, and photochemistry, but also related disciplines and offers the possibility to publish scientific primary data.
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