Iron-Catalyzed Nitrene Transfer Reaction of 4-Hydroxystilbenes with Aryl Azides: Synthesis of Imines via C═C Bond Cleavage
作者:Yi Peng、Yan-Hui Fan、Si-Yuan Li、Bin Li、Jing Xue、Qing-Hai Deng
DOI:10.1021/acs.orglett.9b03160
日期:2019.10.18
C═C bond breaking to access the C═N bond remains an underdeveloped area. A new protocol for C═C bond cleavage of alkenes under nonoxidative conditions to produce imines via an iron-catalyzed nitrene transfer reaction of 4-hydroxystilbenes with aryl azides is reported. The success of various sequential one-pot reactions reveals that the good compatibility of this method makes it very attractive for
Helquats as Promoters of the Povarov Reaction: Synthesis of 1,2,3,4‐Tetrahydroquinoline Scaffolds Catalyzed by Helicene‐Viologen Hybrids
作者:Paul E. Reyes‐Gutiérrez、Tynchtyk T. Amatov、Pavel Švec、Ivana Císařová、David Šaman、Radek Pohl、Filip Teplý、Lubomír Pospíšil
DOI:10.1002/cplu.202000151
日期:2020.10
are structurally linked to helicenes and viologens, and they represent an attractive field of research in chemistry and medicinal chemistry. In the present work they were used as catalysts for the synthesis of 1,2,3,4‐tetrahydroquinolines in good yields by the Povarov reaction. The substrate scope and the capability of different helquats to promote Povarov reactions are demonstrated. Studies to elucidate
[4+2] Cycloaddition reaction of N-arylaldimines with vinyl ethers is effectively catalyzed by ytterbium(III) triflate to give quinoline derivatives in good yields. Furthermore, the reaction with silyl enol ethers affords 4-siloxytetrahydroquinolines, whereas an imino aldol reaction takes place in the reaction with ketene silyl acetals.
Abstract Tungstophosphoric acid has been found to be an efficient catalyst for the synthesis of pyranos- and furanoquinolines through the Imino-Diels–Alderreaction involving one-pot coupling of benzaldehydes, anilines, and 3,4-dihydro-2 H-pyran or 2,3-dihydrofuran. The products are formed at room temperature in excellent yields in a short period of time.
Simple and practical synthesis of pyrano- and furano[3,2-c]-quinoline derivatives under non-Lewis acid catalysis
作者:Rui Huan Liu、Xin Yu、Liang Hu、Nie Fang Yu
DOI:10.1016/j.cclet.2012.06.035
日期:2012.9
One-pot synthesis of substituted pyrano- and furano[3,2-c]quinoline derivatives from appropriately substituted anilines, substituted benzaldehydes and dienophiles via Povarov reaction catalyzed by HCl–ethanol were reported. Good to excellent yields with high diastereoselectivity were obtained in all entries tested.
的一锅法合成取代的吡喃并与呋喃并[3,2- c ^ ]喹啉从适当取代的苯胺,取代的苯甲醛和亲双烯体的衍生物通过通过HCl-乙醇催化波瓦罗夫反应的报道。在所有测试的样品中均获得了具有高非对映选择性的良好至优异的收率。