novel palladium- and copper-catalyzedone-pot multicomponent synthesis of hetero α,α′-dimers of heterocycles via Sonogashira coupling and double cyclization cascade involving imine formation has been developed. This reaction cascade proceeded under mild conditions, providing a powerful synthetic tool for the assembly of π-conjugated systems with a combination of palladium-catalyzed post-direct C–H bond
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.