Organic Letters
Letter
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5) Examples for 2-vinylindoles using as a diene: (a) Eitel, M.;
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10) For examples of (3 + 2) cycloadditions with arynes, see: (a) Del
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13) Crystallographic data for compound 3aa are available free of
charge from the Cambridge Crystallographic Data Centre, accession
number CCDC 1551379.
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Org. Lett. XXXX, XXX, XXX−XXX