Organoaluminum-Mediated Interrupted Nazarov Reaction†
Yonghoon Kwon
Department of Chemistry, University of Alberta, E3-43 Gunning-Lemieux Chemistry Centre, Edmonton, Alberta, T6G 2G2 (Canada)
Search for more papers by this authorDr. Robert McDonald
X-ray Crystallographic Lab, Department of Chemistry, University of Alberta (Canada)
Search for more papers by this authorCorresponding Author
Prof. Frederick G. West
Department of Chemistry, University of Alberta, E3-43 Gunning-Lemieux Chemistry Centre, Edmonton, Alberta, T6G 2G2 (Canada)
Department of Chemistry, University of Alberta, E3-43 Gunning-Lemieux Chemistry Centre, Edmonton, Alberta, T6G 2G2 (Canada)Search for more papers by this authorYonghoon Kwon
Department of Chemistry, University of Alberta, E3-43 Gunning-Lemieux Chemistry Centre, Edmonton, Alberta, T6G 2G2 (Canada)
Search for more papers by this authorDr. Robert McDonald
X-ray Crystallographic Lab, Department of Chemistry, University of Alberta (Canada)
Search for more papers by this authorCorresponding Author
Prof. Frederick G. West
Department of Chemistry, University of Alberta, E3-43 Gunning-Lemieux Chemistry Centre, Edmonton, Alberta, T6G 2G2 (Canada)
Department of Chemistry, University of Alberta, E3-43 Gunning-Lemieux Chemistry Centre, Edmonton, Alberta, T6G 2G2 (Canada)Search for more papers by this authorWe thank NSERC for support of this work.
Graphical Abstract
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References
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- 13Halide trapping of the Nazarov intermediate has been postulated to occur by TiIV-mediated delivery of halogen ligands:
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- 14Triorganoaluminum reagents are highly sensitive to traces of water, and inclusion of molecular sieves in the reaction mixture was found to improve reproducibility.
- 15CCDC 915117 (3 a), 915118 (3 h), 915119 (7 a), 915120 (8 a′), and 915121 (11 a) contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif.
- 16While we have occasionally observed competing 1,4-addition of nucleophilic traps to Lewis acid-activated dienones, simple 1,2-addition has not been observed previously.
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- 19Consistent chemical shift differences for methyl groups cis and trans to adjacent phenyl groups have been observed in this study and in previous cases. See reference [17a] for an example.
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- 24Catalytic amounts of DBU were added to an NMR tube containing 11 a′ and the reaction was monitored by 1H NMR spectroscopy over 15 h. During this time, 40 % conversion into 11 a was observed.