Journal
TETRAHEDRON
Volume 64, Issue 8, Pages 1879-1887Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2007.11.090
Keywords
cycloaddition reactions; 2-pyridones; dihydro-2-pyridones; conjugated dienes
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Cycloaddition reactions of sulfoxide- and sulfone-substituted dihydro-2-pyridones and 2-pyridones with electron-rich dienes gave new bicyclic and tricyclic products in good to fair yields. The reactivity, regioselectivity, and stereoselectivity of these reactions were compared with semi-empirical theoretical calculations. Evidence is provided for rather unusual two parallel reaction pathways for the cross-Diels-Alder reaction of a sulfone-substituted 2-pyridone with cyclopentadiene. (C) 2007 Elsevier Ltd. All rights reserved.
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