Enantioselective synthesis of spirooxindole benzoquinolizines via organo-catalyzed cascade reactions.

A Michael-Mannich-hemiaminalization-dehydration cascade reaction was developed for the construction of spirooxindole benzoquinolizine derivatives. Additionally, spirooxindole benzoindolizidine was prepared conveniently through a ring-contracted rearrangement reaction from spirooxindole benzoquinolizine.