The oxidative carbonylation of N-protected indoles was investigated to directly synthesize indole-3-carboxylic acids. Using Rh(III)-zeolites as heterogeneous catalysts, the single-site Rh-species reach unprecedented activities (>100 turnovers), while the metal is readily recovered after reaction. X-ray absorption spectroscopy (XAS) provided evidence for site-isolation of Rh(III) species on the zeolite.
S. Van Minnebruggen, C. Marquez, B. Krasniqi, K. Janssens, N. Van Velthoven, J. Vercammen, B. De Soete, A. Bugaev and D. De Vos, Chem. Commun., 2023, 59, 2319 DOI: 10.1039/D2CC05953C
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