Article

Iodocyclization of o-Alkynylbenzamides Revisited: Formation of Isobenzofuran-1(3H)-imines and 1H-Isochromen-1-imines Instead of Lactams

Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
Institute of Organic Chemistry, University of Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
J. Org. Chem., 2012, 77 (22), pp 10118–10124
DOI: 10.1021/jo3017378
Publication Date (Web): October 22, 2012
Copyright © 2012 American Chemical Society

Abstract

Abstract Image

The iodocyclization of o-alkynylbenzamides with various electrophiles has been reported to yield five- or six-membered lactams by nucleophilic attack of the amide nitrogen onto the triple bond. While the formation of an isobenzofuran-1(3H)-imine with two bulky substituents under Larock conditions was initially attributed to steric hindrance, we found out that cyclization via the amide oxygen is the rule rather than the exception. Thus, the structures of the products reported in the literature need to be revised.

Supporting Information


General methods, spectra for all compounds, final energies and coordinates from DFT calculations, and crystallographic information files (CIFs) of 8, 11a, 11b, 13a, and 13b. This material is available free of charge via the Internet at http://pubs.acs.org.

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Received 16 August 2012
Published online 22 October 2012
Published in print 16 November 2012
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