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Original Articles

Fe(III)-Catalyzed Cycloaddition Reaction of In Situ Formed Imines With Cyclic Enol Ethers

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Pages 839-843 | Received 15 May 2013, Accepted 02 Nov 2013, Published online: 18 Nov 2014
 

Abstract

Fe(ClO4)3 and silica gel adsorbed Fe(ClO4)3 are reported as catalysts for [4+2] cycloaddition reactions of imines (formed in situ from anilines and enol ethers) with cyclic enol ethers to afford the corresponding pyrano- and furano[3,2-c]quinolines in good to excellent yields. Also, the catalytic activity of Fe(ClO4)3 in different solvents was compared with the other iron catalysts such as FePO4, Fe2(SO4)3.XH2O, (NH4)Fe(SO4)2.12H2O, Fe(acac)3, Fe(DS)3, Fe(OH)3, FeCl3.6H2O, and Fe(NO3)3.9H2O.

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