Issue 65, 2014

Investigation of oxidopyrylium–alkene [5+2] cycloaddition conjugate addition cascade (C3) sequences

Abstract

Novel oxidopyrylium–alkene [5+2] cycloaddition conjugate addition cascade (C3) sequences are described. Various acetoxypyranone–alkenes with pendant nucleophiles undergo [5+2] cycloaddition followed by conjugate addition from the concave face of the intermediate pyranone toward bridged, tetracyclic ethers. In several cases, 3 new rings, 4 new bonds, and 6 new contiguous stereocenters are constructed with excellent diastereoselectivity. Finally, an asynchronous concerted reaction pathway is proposed to explain the high diastereoselectivity of the oxidopyrylium–alkene [5+2] C3.

Graphical abstract: Investigation of oxidopyrylium–alkene [5+2] cycloaddition conjugate addition cascade (C3) sequences

Supplementary files

Article information

Article type
Communication
Submitted
30 May 2014
Accepted
13 Jun 2014
First published
19 Jun 2014

Chem. Commun., 2014,50, 9130-9133

Author version available

Investigation of oxidopyrylium–alkene [5+2] cycloaddition conjugate addition cascade (C3) sequences

J. A. Simanis, C. M. Law, E. L. Woodall, C. G. Hamaker, J. R. Goodell and T. A. Mitchell, Chem. Commun., 2014, 50, 9130 DOI: 10.1039/C4CC04163A

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