1. For selected reviews, see (a) Donnely D.M.X., Meegan M.J., in Comprehensive Heterocyclic Chemistry, Eds.: Katritzky A.R., and Rees C.W., Vol. 4, Pergamon, Oxford, 1984, p. 657.
2. (b) Keay B.A., Dibble P.W., in Comprehensive Heterocyclic Chemistry II, Eds.: Katritsky A.R., Rees C.W., and Scriven E.F.W., Vol. 2, Elsevier, Oxford, 1997, p. 395.
3. (c) Hou X.L., Yang Z., Wong H.N.C., Prog. Heterocycl. Chem., 15, 2003, 167.
4. For selected reviews, see (a) Bird C.W., Cheeseman G.W., in Comprehensive Heterocyclic Chemistry, Eds.: Katritzky A.R., and Rees C.W., Vol. 4, Pergamon, Oxford, 1984, Chapters 1–3.
5. (b) Dean F.M., Sargent M., in Comprehensive Heterocyclic Chemistry, Eds.: Katritzky A.R., and Rees C.W., Vol. 4, Pergamon, Oxford, 1984, Chapters 10–11.