[1] J. A. Joule, K. Mills, Heterocyclic Chemistry, 4th ed.; Black Science: Oxford, U.K., 2000; Chapter 25.
[2] J.A. Montgomery, J.A., Secrist, III. In Comprehensive Heterocyclic Chemistry; A.R. Katritzky, C.W. Rees, Eds.; Pergamon Press: Oxford, 1984; Vol. 5, p 614.
[3] D. Kitazawa, G. Tominaga, A. Takano, Jpn. Kokai Tokkyo Koho JP 2001057292; Chem. Abstr. 134 (2001) 200276.
[4] H. Nakamura, H. Yamamoto, PCT Int. Appl. WO 2005043630; Chem. Abstr. 142 (2005) 440277.
[5] Fuentes, W.W. Paudler, J. Org. Chem. 40 (1975) 1210.
[6] J.D. Bower, G.R. Ramage, J. Chem. Soc. (1955) 2834.
[7] E. Abushanab, A.P. Bindra, J. Org. Chem. 38 (1973) 2049.
[8] N.F. Ford, L.J. Browne, T. Campell, C. Gemenden, R.C. Gude, J.W.F. Waley, J. Med. Chem. 28 (1985) 164.
[9] J. Bourdais, A.-M.E. Omar, J. Heterocycl. Chem. 17 (1980), 555.
[10] D.J. Hlasta, M. Silbernagel, Heterocycles, 48 (1998) 1015.
[11] J.A. Montgomery, J.A. Secrist, In Comprehensive Heterocyclic Chemistry; A.R. Katritzky, C.W. Rees, Eds.; Pergamon Press: Oxford, 1984; Vol. 5, p 634.
[12] P. Blatcher, D. Middlemiss, Tetrahedron Lett. 21 (1980) 2195.
[13] D. Hlasta, Tetrahedron Lett. 1990, 31, 5833.
[14] L.J. Browne, C. Gude, H. Rodriguez, R.E. Steele, A. Bhatnager, J. Med. Chem. 34 (1991) 725.
[15] T. Benincori, E. Brenna, F. Sannicolo, J. Chem. Soc., Perkin Trans. 1 (1993) 675.
[16] F. Shibahara, A. Kitagawa, E. Yamaguchi, T. Murai Org. Lett. 8 (2006) 5621.
[17] D. Kim, L. Wang, J.J. Hale, C.L. Lynch, R.J. Budhu, M. MacCoss, S.G. Mills, L. Malkowitz, S.L. Gould, J.A. DeMartino, M.S. Springer, D. Hazuda, M. Miller, J. Kessler, R.C. Hrin, G. Carver, A. Carella, K. Henry, J. Lineberger, W.A. Schleif, E.A. Eminic, Bioorg. Med. Chem. Lett. 15 (2005) 2129.
[18] M.E. Bluhm, M. Ciesielski, H. G?rls, D?ring, M. Angew. Chem., Int. Ed. 41 (2002) 2962.
[19] M.E. Bluhm, C. Folli, D. Pufky, M. Kr?ger, O. Walter, M. D?ring, Organometallics 24 (2005) 4139.
[20] A.P. Krapcho, J.R. Powell, Tetrahedron Lett. 27 (1986) 3713.
[21] F. Palacios, C. Alonso, G. Rubiales, Tetrahedron 51 (1995) 3683.
[22] A.R. Katritzky, G. Qiu, J. Org. Chem. 66 (2001) 2862.
[23] J. Wang, L. Dyers, R. Mason, P. Amoyaw, X.R. Bu, J. Org. Chem. 70 (2005) 2353.
[24] J. Wang, R. Mason, D. VanDerveer, K. Feng, X.R. Bu, J. Org. Chem. 68 (2003) 5415.
[25] S.A. Siddiqui, T.M. Potewar, R.J. Lahoti, K.V. Srinivasan, Synthesis (2006) 2849.