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Give me a ring! A cationic RhI catalyst promotes the formation of fused arenes containing a five-membered ring (see scheme) by an aromatic amino-Claisen rearrangement of N-propargyl aniline derivatives in refluxing hexafluoro-2-propanol (HFIP). cod=1,5-cyclooctadiene, dppp=1,3-bis(diphenylphosphanyl)propane, Tf=trifluoromethanesulfonyl.
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Saito et al. (2007) studied this question.
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