A P 4 S 10 ‐promoted [5 + 1] spiroannulation of 2‐(2‐nitrophenyl)‐indoles with cyclic ketones for the preparation of spirocyclic tetrahydrocarbolines has been described. The present approach afforded a series of structurally valuable spirocyclic tetrahydrocarbolines in moderate to good yields under metal‐free conditions. In this work, nitro reduction, C–N condensation, and spiroannulation were realized in one pot.
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Yin et al. (2025) studied this question.
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