A New Multicomponent Domino Reaction of 1,3-Dicarbonyl Compounds: One-Pot Access to Polycyclic <i>N</i>/<i>O-</i>, <i>N</i>/<i>S-</i>, and <i>N</i>/<i>N-</i>Aminals
[reaction: see text] The first multicomponent domino transformation between 1,3-dicarbonyls 1, alpha,beta-unsaturated compounds 2, and functionalized amines 3 is described, providing a one-pot access to fused polyheterocyclic or spiropolyheterocyclic compounds 5 or 6 bearing an aminal function by formation of up to three new cycles, five novel bonds, and up to six stereogenic centers.