Palladium-Catalyzed Cyclization Reactions of Acetylene-Containing ...

Palladium-Catalyzed Cyclization Reactions of Acetylene-Containing Amino AcidsFULL PAPERS[20] For recent examples, see e.g.: P. A. Jacobi, H. Liu, J. Org. Chem. 2000,65, 7676; P. A. Jacobi, J. Guo, S. Rajeswari, W. J. Zheng, J. Org. Chem.1997, 62, 2907; P. A. Jacobi, H. L. Brielamn, S. I. Hauck, J. Org.Chem. 1996, 61, 5013.[21] M. W. Kahn, N. G. Kundu, Synlett 1997, 1435.[22] R. H. Summerville, P. Von Rague Schleyer, J. Am. Chem. Soc. 1974,96, 1110.[23] G. Kokotos, Synthesis 1990, 4, 299.[24] D. F. Ewingand, D. G. Neilson, J. Org. Chem. 1966, 31, 390.[25] Ref. [3b] , pp. 510-511.[26] N. Tsukada, Y. Yamamoto, Angew. Chem. Int. Ed. 1997, 36, 2477; Y.Yamamoto, U. Radhakrishnan, Chem. Soc. Rev. 1999, 28, 199.[27] D. Bouyssi, J. Gore, G. Balme, Tetrahedron 1992, 48, 10103.[28] T. Jeffery, Tetrahedron Lett. 1999, 40, 1673; T. Jeffery, M. David,Tetrahedron Lett. 1998, 39, 5751; T. Jeffery, Tetrahedron Lett. 1996, 52,10113.[29] For a recent reviewon N-acyliminium ions and related intermediates,see: W. N. Speckamp, M. J. Moolenaar, Tetrahedron 2000, 56,3817.[30] For some recent publications on tertiary N-acyliminium ions, see e.g.:L. Ollero, G. Mentink, F. P. J. T. Rutjes, W. N. Speckamp, H.Hiemstra, Org. Lett. 1999, 1, 1331; M. A. Brodney, A. Padwa, J.Org. Chem. 1999, 64, 556; N. Langlois, P. K. Choudhury, TetrahedronLett. 1999, 40, 2525; S. F. Martin, S. K. Bur, Tetrahedron Lett. 1997, 38,7641.[31] W. C. Still, M. Kahn, A. Mitra, J. Org. Chem. 1978, 43, 2923.Adv. Synth. Catal. 2002, 344, 70±83 83