What question did this study set out to answer?

To develop a unified catalytic method for the enantioselective dimerization, arylation, and amination of tryptamines.

Unified N -Sulfonylated Urea Catalyzed Enantioselective Dimerization, Arylation, and Amination of Tryptamines: Total Synthesis of Five Pyrroloindoline Alkaloids

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Randomized trial demonstrates enantioselective dimerization in tryptamines, highlighting novel synthetic pathways.

To develop a unified catalytic method for the enantioselective dimerization, arylation, and amination of tryptamines.
Utilized a bifunctional N-sulfonylated urea catalyst for dimerization reactions.
Implemented dearomative iodocyclization/dimerization cascades for asymmetric synthesis.
Showcased applications in total syntheses of five pyrroloindoline alkaloids.
Achieved efficient and versatile enantioenrichment of dimeric, arylated, and aminated pyrroloindolines.
Successfully synthesized (−)-folicanthine, (−)-chimonanthine, (+)-calycanthine, (−)-psychotriasine, and (−)-psychotetramine.

Tian et al. (2026) studied this question.

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