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Gilbert Stork developed strategies for selective organic synthesis, including enamine alkylation. An enamine provides a way to form a new carbon–carbon chemical bond at a chosen position, linking a temporary nitrogen-containing intermediate with the construction of a carbon skeleton. His oral history describes this work alongside polyene cyclization and the synthesis of natural products.^[ref]

Tropinone is a nitrogen-containing bicyclic ketone in the tropane alkaloid family. Its bridged framework combines a carbonyl group with a ring amine, making it a compact target for studying how several bonds can be constructed in one planned sequence.

Robert Robinson's 1917 synthesis joined small precursors through a coordinated sequence of condensations, building the bridged skeleton instead of constructing each ring independently.^[ref] The example remains instructive in organic synthesis: choosing mutually compatible reactive fragments can simplify a target more effectively than merely shortening each isolated step.