Rhodium-Catalyzed Reaction of 2H-Azirines with Carbonyl-ene-yne Compounds Giving 1-Furyl-2-aza-1,3-dienes

A rhodium(II)-catalyzed reaction of carbonyl-ene-yne compounds, which are used as furylcarbene precursors, with 2H-azirines gave 1-furyl-2-aza-1,3-dienes as products. We propose that the title compounds are formed by the addition of furylcarbene-rhodium(II) complexes to 2H-azirines followed by opening of 2H-azirine rings.