Abstract
Reported is the synthesis of 6H-benzo[c]chromenes 3 via the palladium-catalyzed annulation of 2-(2-iodophenoxy)-1-substituted ethanones 1 with arynes generated in situ from 2. Both EDGs and EWGs were uniformly tolerated on the 2-iodophenoxy starting material. A lower yield was observed for an aliphatic ketone (R² = Me, 30% yield) compared to the aromatic ketones. Application of substituted aryne precursors led to an equimolar mixture of regioisomers as expected. Two possible mechanisms are presented, although proof for the formation of the aryne (e.g. by trapping with furan) is lacking.
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