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We found that nitrogen‐containing Lewis base mediated [4+2] annulation of but‐3‐yn‐2‐one with activated ketones could proceed efficiently to give the corresponding 2,3‐dihydropyran‐4‐ones in moderate to good yields under mild conditions. The substrate scope has been carefully examined. Moreover, a plausible reaction mechanism for the [4+2] annulation of but‐3‐yn‐2‐one with activated ketones mediated...
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