Abstract
Abstract3‐(2H‐Pyran‐2‐on‐6‐yl)indolizines 6a‐d were prepared by 1,3‐dipolar cycloaddition reactions of N‐(2H‐pyran‐2‐on‐6‐yl)methylpyridinium bromides 5a,b with dimethyl acetylenedicarboxylate (DMAD). All of the cycloaddition reactions of 6b with N‐phenylmaleimide, p‐benzoquinone, and DMAD took place at the 2‐pyrone ring to give 3‐substituted indolizines.
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