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The formal [3+2] dipolar cycloaddition (or annulation) of donor‐acceptor cyclopropanoate esters with pyridines and 5‐nitroquinoline is reported. Electron‐deficient pyridine dipolarophiles (R=CN, CO2Et, COMe) participate in the annulation whereas electron rich species do not. The product 2,3‐dihydroindolizines undergo rapid autooxidation, and the X‐ray structures for two of the aromatic products are reported.
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Morra et al. (2006) studied this question.
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