Construction of Octahydro‐4H‐cyclopentapyridin‐6‐one Skeletons using Pot, Atom, and Step Economy (PASE) Synthesis

Cascade aza‐Piancatelli reaction and [3+3]/[4+2] cycloaddition reactions are carried out using the ideality principles of pot, atom, and step economy (PASE) synthesis. The reaction resulted in generation of octahydro‐4H‐cyclopenta[b]pyridin‐6‐one scaffolds. Moreover, octahydro‐5,7a‐epoxycyclopenta[cd]isoindol‐4‐one frameworks of gracilamine alkaloid and a novel decahydro‐1H‐dicyclopenta[cd,hi]isoindol‐6‐one were also realized in good yields with excellent regio‐ and diastereo‐selectivities.