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worth noting that a detailed characterization of this clay was recently published (20Si and 27 Al MAS-NMR, SEM, IR-Py, DTA and TG). Miranda, R.; Rios, H.; Salmón, M.; Cogordán, J. A.; Castro, M.; Delgado, F. Appl. Cat. A: General 2003, 244, 217. 20. Heterocyclic Preparative Chemistry; 1980 To 2003, Miranda, R.; Arroyo, G.A.; Penieres, G.; Salmón, M.; Cabrera, A.; Álvarez, C.; Delgado; F. Research Trends 2003, in press. 21. Kappe, C. O. J. Org. Chem. 1997, 62, 7201. 22. (a) Hu, E. H.; Sidler, D. R.; Dolling, U. H. J. Org. Chem. 1998, 63, 3454. (b) Wang, L.; Qian, C.; Tian, H.; Ma, Y. Synth. Commun. 2003, 33, 1459. (c) Salehi, P.; Dabiri, M.; Zolfigol, M. A.; Bodaghi, M. A. Tetrahedron Lett. 2003, 44, 2889. 23. (a) Loev, B. J. Med. Chem. 1974, 17, 956. (b)Vigante, B. Khimiya Geterotsiklisheskikh Soedinenii 1982, 2, 219. (c) Watanabe, Y. Synthesis 1983, 9, 761. (d) Singh, H. Heterocycles 1986, 24, 3039. 24. Pool, G. C.; Teuben, J. H. IR Radiation as a Heat Source in Vacuum Sublimation, in: Practical Organometallic Chemistry; Wayda A. L.; Darensbourg M. Y., Eds; Washington D. C. 1987.
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