Addition/Correction pubs.acs.org/JACS
Correction to “Cyclization Cascades Initiated by 1,6-Conjugate Addition” Joshua L. Brooks and Alison J. Frontier* J. Am. Chem. Soc. 2012, 134, 16551−16553. DOI: 10.1021/ja308451y Pages 16552−3. The structures of compounds 7−11 (Table 3) were assigned incorrectly. Recent experimental results indicate that products 7−11 are pyrans, constitutional isomers of the structures reported. The data suggest that pyran formation occurs via intramolecular enolate alkylation in cyclic acetoxonium species 13a, which is a geometrical isomer of proposed intermediate 13 (Scheme 2). A paper is in preparation that will provide a full explanation of the cyclization chemistry of dienyl diketones of type 4, including experimental data supporting the revised structure assignment of products 7−11.
Published: December 13, 2013 © 2013 American Chemical Society
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dx.doi.org/10.1021/ja4118363 | J. Am. Chem. Soc. 2013, 135, 19362−19362
