Sequential enantioselective Ugi-4CR/post-Ugi transformation strategy: a precise construction of structurally diverse azaspiro polycyclic scaffolds

A privileged strategy has been developed for the precise construction of enantioenriched azaspiro polycyclic scaffolds. Structurally diverse azaspiro polycycles bearing multiple contiguous stereocenters are obtained with excellent results (up to 99:1 e.r., >95:5 d.r.) via sequential enantioselective four-component Ugi reactions/post-Ugi transformations with substrates containing prerequisite functional groups in the presence of anionic stereogenic-at-cobalt(III) complexes.