A versatile core structure has been prepared that should provide a foundation for the syntheses of the hetidine- and hetisine-type diterpenoid alkaloids. The synthesis of the caged polycyclic core structure, which features nine contiguous stereocenters, utilizes a GaIII-catalyzed cycloisomerization of an alkynyl indene as well as a Michael/aldol sequence to build the bicyclo[2.2.2] framework.
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