Novel intramolecular cycloisomerizations of nitrogen-tethered cyclopropenes with indole in the presence of Brønsted acids have been developed. The reactions proceeded through the same pathway but stopped at different stages according to different substituent styles, affording azocino[5,4-b]indole 2 and (epiminoethano)cyclopenta[b]indole 4 in moderate to good yields.
P. Zhu, X. Tang and M. Shi, Chem. Commun., 2016, 52, 7245 DOI: 10.1039/C6CC02226J
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