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Issue 24, 2016
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A convenient domino Ferrier rearrangement-intramolecular cyclization for the synthesis of novel benzopyran-fused pyranoquinolines

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Abstract

The Ferrier rearrangement and the Povarov reaction have proven indispensable tools in carbohydrate chemistry and the synthesis of N-heterocycles, respectively. We hereby report a one-pot cyclization sequence involving the Ferrier and Povarov-like reactions in the synthesis of novel pentacyclic N-heterocycles: benzopyran-fused pyranoquinolines. The reaction entails three component condensation of a glycal with a variety of anilines and 2-hydroxybenzaldehydes under Lewis acid catalysis to yield the title compounds in 4–24 hours of reaction time, in moderate to high yields and excellent diastereoselectivity. Of the Lewis acid catalysts deployed [Sc(OTf)3, Al(OTf)3, Cu(OTf)2, CuOTf, I2, InCl3, and La(OTf)3] in various solvents (acetonitrile, THF, dichloromethane, 1,2-dichloroethane and diethyl ether) at room and elevated temperatures, Sc(OTf)3 (10 mol%) in acetonitrile at 70 °C gave the best results, with excellent diastereoselectivity. CAN-mediated oxidative ring opening of the pentacyclic N-heterocycle gave the corresponding enantiometrically pure chromenoquinoline bearing a pendant sugar moiety.

Graphical abstract: A convenient domino Ferrier rearrangement-intramolecular cyclization for the synthesis of novel benzopyran-fused pyranoquinolines

  • This article is part of the themed collection: New Talent
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Publication details

The article was received on 11 Dec 2015, accepted on 15 Jan 2016 and first published on 15 Jan 2016


Article type: Paper
DOI: 10.1039/C5OB02536B
Citation: Org. Biomol. Chem., 2016,14, 5627-5638
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    A convenient domino Ferrier rearrangement-intramolecular cyclization for the synthesis of novel benzopyran-fused pyranoquinolines

    P. T. Moshapo, M. Sokamisa, E. M. Mmutlane, R. M. Mampa and H. H. Kinfe, Org. Biomol. Chem., 2016, 14, 5627
    DOI: 10.1039/C5OB02536B

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