1. bJohnson, C. D.; Balasubramanian, M.; Keay, J. G.; Hepworth, J. D.; Geen, G. R. Comprehensive Heterocyclic Chemistry II, 2nd ed. Katritzky, A. R.; Rees, C. W.; Scriven, E. F. V., Eds. Pergamon: Oxford, 1996; Vol. 5, pp 1–500.
2. cAlvarez-Builla, J. Modern Heterocyclic Chemistry; Vaquero, J. J.; Barluenga, J., Eds. Wiley-VCH: Weinheim, Germany, 2011; pp 1–9.
3. d Heterocyclic
Chemistry in Drug Discovery; Li, J.J., Ed. Wiley: Hoboken, NJ, 2013; pp 1–16.
4. eKiuru, P.; Yli-Kauhaluoma, J. Heterocycles in Natural Product Synthesis; Majumdar, K. C.; Chattopadhyay, S. K., Eds. Wiley-VCH: Weinheim, Germany, 2011; pp 267–297.