Electrochemical Synthesis of Tetrahydroquinolines from Imines and Cyclic Ethers
<i>via</i>
Oxidation/Aza‐Diels‐Alder Cycloaddition
作者:Vera A. Vil'、Sergei S. Grishin、Elena P. Baberkina、Anna L. Alekseenko、Alexey P. Glinushkin、Alexey E. Kovalenko、Alexander O. Terent'ev
DOI:10.1002/adsc.202101355
日期:2022.3.15
Electrochemicalsynthesis of cyclic ether-annulated tetrahydroquinolines from imines and cyclic ethers in an undivided cell under constant current conditions was developed. The electrosynthesis proceeds via the enol ether formation from ethers following the aza-Diels-Alder [4+2] cycloaddition. The method is applicable to a wide range of imines and results in the desired products in yields of 23 to
Aza-Diels-Alder reaction between imines and 2,3-dihydrofuran under radical cation induced conditions was achieved and series of hexahydrofuro[3,2-c]quinoline derivatives was prepared. The stereoselectivity was affected by the substituents on imines, which revealed a stepwise mechanism. A radical cation mediated mechanism was proposed to rationalize the formation of the products.
作者:Luiz da Silva-Filho、Bruno da Silva、Lucas Martins
DOI:10.1055/s-0032-1316587
日期:2012.8
A single-step method for the synthesis of furan- and pyranoquinoline derivatives through multicomponent Povarov reactions between aniline derivatives, benzaldehyde and two different enol ethers (2,3-dihydrofuran and 3,4-dihydropyran) usingniobiumpentachloride as catalyst under mild conditions, providing good yields and high diastereoselectivity, is described.
Imino Diels–Alder reactions: One-pot synthesis of tetrahydroquinolines
作者:Vinod T. Kamble、Bhaskar S. Davane、Sanjay A. Chavan、Dnyanoba B. Muley、Sandeep T. Atkore
DOI:10.1016/j.cclet.2009.11.016
日期:2010.3
Abstract An efficientsynthesis of tetrahydroquinoline derivatives is reported via three component coupling reactions of aldehydes and anilines with various dienophiles in the presence of a catalytic amount of perchloric acid adsorbed on silica gel (HClO 4 –SiO 2 ) under mild reaction conditions.
Study and application of graphene oxide in the synthesis of 2,3-disubstituted quinolines <i>via</i> a Povarov multicomponent reaction and subsequent oxidation
作者:Samantha Caputo、Alessandro Kovtun、Francesco Bruno、Enrico Ravera、Chiara Lambruschini、Manuela Melucci、Lisa Moni
DOI:10.1039/d2ra01752k
日期:——
The carbocatalyzed synthesis of 2,3-disubstituted quinolines is disclosed. This process involved a three-component Povarov reaction of anilines, aldehydes and electron-enriched enol ethers, which gave the substrate for the subsequent oxidation. Graphene oxide (GO) was exploited as a heterogeneous, metal-free and sustainable catalyst for both transformations. The multicomponent reaction proceeded under