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Heterogeneous Gold‐Catalyzed Selective Reductive Transformation of Quinolines with Formic Acid
Authors:Lei Tao  Qi Zhang  Shu‐Shuang Li  Xiang Liu  Yong‐Mei Liu  Yong Cao
Abstract:Single phase rutile titania supported gold nanoparticles (Au/TiO2‐R) are found to be efficient and versatile catalysts for chemo‐ and regioselective transfer hydrogenation of quinoline derivatives to 1,2,3,4‐tetrahydroquinolines (THQs) using formic acid (FA) as a safe and convenient hydrogen source under mild conditions. The activity and chemoselectivity of the Au/TiO2‐R catalyst towards THQs is excellent, with a substrate to catalyst ratio (S/C) of 1000 being feasible. Furthermore, a straightforward and selective route to N‐formyltetrahydroquinolines (FTHQ) directly from quinoline compounds and FA by one‐pot, gold‐catalyzed reductive N‐formylation protocol is also established.
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Keywords:gold  heterogeneous catalyst  nanoparticles  N‐formylation  quinolines  transfer hydrogenation
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