1. G. R. Allen,Organic Reactions, Vol. 20, Wiley Interscience, New York (1973), p. 337.
2. V. G. Granik, V. M. Lyubchanskaya, and T. I. Mukhanova,Khim.-farm. Zh., No. 6, 37 (1993).
3. V. M. Lyubchanskaya, L. M. Alekseeva, and V. G. Granik,Tetrahedron,53, No. 44, 15005 (1997).
4. US Pat. 4751302, T. Ibuki, T. Sugihara, H. Kawakubo, and T. Sone;Chem. Abs.,109, 170420 (1988).
5. G. A. Conway, L. J. Loeffler, and J. H. Hall,J. Med. Chem.,26, 876 (1983).