This research demonstrates a novel domino reaction to synthesize indolizines, suggesting efficient production of useful compounds.
A novel domino reaction for synthesizing 3-acylaminoindolizines from 4-alkylidene oxazolones and 2-(pyridine-2-yl)acetates has been developed. Promoted by N-iodosuccinimide and synergistically assisted by FeCl₃ and DABCO, this protocol provides direct access to a diverse array of functionalized indolizines in up to 92% yield. The method features a broad substrate scope (35 examples), high efficiency, operational simplicity, and excellent scalability. A plausible reaction mechanism involving a cascade of spiroannulation, hydrolytic ring-opening, decarboxylation, and oxidative aromatization is proposed.
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Hu et al. (2026) studied this question.
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