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Demonstrates efficient synthesis of polycyclic compounds in organic chemistry, highlighting novel reaction pathways.
Polycyclic indoline‐benzodiazepines can be accessed through the intermolecular reaction of Tröger bases with N ‐sulfonyl‐1,2,3‐triazoles. Under Rh II catalysis, α‐imino carbenes are generated and a subsequent cascade of [1,2]‐Stevens, Friedel–Crafts, Grob, and aminal formation reactions yield the polycyclic heterocycles as single isomers (d.r.>49:1, four stereocenters including two bridgehead N atoms). Further ring expansion by insertion of a second α‐imino carbene leads to elaborated polycyclic 9‐membered‐ring triazonanes.
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Bosmani et al. (2018) studied this question.
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