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A Photocatalyzed Cascade Approach Toward the Tetracyclic Core of Akuammiline Alkaloids.

A cascade approach toward the tetracyclic core of akuammiline alkaloids which features high modularity and convergence is reported. Distinct substitution pattern can be readily introduced to the tetracyclic core by varying three building blocks with similar complexity. The critical event in the cascade is a regio- and stereoselective 1,2-shift enabled by a carbocation that sets up the core.