Abstract
A Rh(III)-catalyzed oxidative C–H/C–H cross-coupling between indoles and oxazoles with molecular oxygen as an oxidant has been developed to construct a variety of 2-(indol-2-yl)oxazoles. The chelation-assisted strategy endows this catalytic system with an excellent C2-site selectivity by introducing a pyrimidyl directing group. In addition, polycyclic pyridinium salts are also obtained via Rh(III)-catalyzed C–H activation/cyclization of 2-(indol-2-yl)oxazoles with alkynes.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (21672154, 21372164). We thank the Comprehensive Training Platform of Specialized Laboratory, College of chemistry, Sichuan University, for NMR measurements and HRMS measurements.
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Wang, Y., Lan, J. Oxygen as an oxidant in rhodium(III) catalyzed oxidative C–H/C–H cross-coupling between indoles and oxazoles. Sci. China Chem. 61, 200–205 (2018). https://doi.org/10.1007/s11426-017-9053-7
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DOI: https://doi.org/10.1007/s11426-017-9053-7