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Substrate scope for the addition of arynes and cyclic alkynes to pyrone 29. aReaction run at 50 °C. bReaction run at 40 °C for 36 h. cReaction run for 36–39 h. dReaction run at 40 °C. OTf = trifluoromethanesulfonate, Cbz = benzylcarbamate, Boc = tert-butyloxycarbonyl.
