Abstract
Two libraries of novel, bifunctional polycyclic cage structures have been synthesized for the first time in an ionic liquid, 1-butyl-3-methylimidazolium bromide ([bmim]Br), employing a sustainable microwave-assisted, one-pot, three-component [3+2] cycloaddition–annulation protocol in good to excellent yields. The ring systems thus generated contain as structural elements bridged, fused and spiro rings and were obtained with complete regio- and stereoselectivity through the creation of two C–C and two C–N bonds, which led to the generation of two azaheterocyclic rings and five adjacent stereogenic carbons, three of which are quaternary.
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