Asymmetric organocatalytic vinylogous Michael addition triggered triple-cascade reactions of 2-hydroxycinnamaldehydes and vinylogous nucleophiles: construction of benzofused oxabicyclo[3.3.1]nonane scaffolds

An organocatalytic vinylogous Michael addition triggered triple-cascade reaction of 2-hydroxycinnamaldehydes and α,α-dicyanoalkenes was reported, yielding benzofused oxabicyclo[3.3.1]nonanes with excellent stereoselectivities.