1. (a) Tornoe, C. W.; Christensen, C.; Meldal, M. J. Org. Chem. 2002, 67, 3057. (b) Rostovtsev, V. V.; Green, L. G.; Fokin, V. V.; Sharpless, K. B. Angew. Chem., Int. Ed. 2002, 41, 2596.
2. For recent reviews, see: (a) Kushwaha, D.; Dwivedi, P.; Kuanar, S. K.; Tiwari, V. K. Curr. Org. Synth. 2013, 10, 90. (b) Aragão-Leoneti, V.; Campo, V. L.; Gomes, A. S.; Field, R. A.; Carvalho, I. Tetrahedron 2010, 66, 9475. (c) Dondoni, A. Chem.–Asian. J. 2007, 2, 700.
3. Merino-Montiel, P.; López, Ó.; Álvarez, E.; Fernández-Bolaños, J. G. Tetrahedron 2012, 68, 4888.
4. Ferreira, S. B.; Sodero, A. C. R.; Cardoso, M. F. C.; Lima, E. S.; Kaiser, C. R.; Silva, F. P., Jr.; Ferreira, V. F. J. Med. Chem. 2010, 53, 2364.
5. (a) Salameh, B. A.; Leffler, H.; Nilsson, U. J. Bioorg. Med. Chem. Lett. 2005, 15, 3344. (b) Tejler, J.; Salameh, B.; Leffler, H.; Nilsson, U. J. Org. Biomol. Chem. 2009, 7, 3982.