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[4] (a) Dethe, D.-H.; Boda, R.; Das, S. Chem. Commun. 2013, 49(31), 3260 and references therein. (b) Bera, K.; Schneider, C. Chem. Eur. J. 2016, 22, 7074. (c) Feldman, K.-S.; Gonzalez, I.-Y.; Glinkerman, C.-M. J. Am. Chem. Soc. 2014, 136(43), 15138.
[5] Tang, X.-D.; Li, S.; Guo, R.; Nie, J.; Ma, J.-A. Org. Lett. 2015, 17(6), 1389.