1. N. M. Ivanova, B. A. Cheskis, A. M. Moiseenkov, and O. M. Nefedov, Izv. Akad. Nauk SSSR, Ser. Khim., No. 1, 225 (1990); A. M. Moiseenkov, B. A. Cheskis, N. M. Ivanova, and O. M. Nefedov, Org. Prep. Proced. Int.,22, No. 2, 215 (1990); B. A. Cheskis, N. M. Ivanova, A. M. Moiseenkov, and O. M. Nefedov, Izv. Akad. Nauk SSSR, Ser. Khim., No. 9, 2025 (1990).
2. W. Coppens and N. Schamp, Bull. Soc. Chim. Belg.,81, No. 11?12, 643 (1972).
3. T. Mukaiyama, Org. React.,28, 203 (1982); M. Vaultier, P. H. Lambert, and K. Carrié, Bull. Soc. Chim. Fr., No. 1, 83 (1986); P. Sulmon, N. De Kimpe, and N. Schamp, Synthesis, No. 1, 8 (1989).
4. V. V. Veselovsky, A. S. Gybin, A. V. Lozanova, et al., Tetrahedron Lett.,29, No. 2, 175 (1988); R. B. Mitra and G. B. Reddy, Synthesis, No. 9, 694 (1989); V. V. Veselovskii, A. S. Gybin, A. V. Lozanova, et al., Izv. Akad. Nauk SSSR, Ser. Khim., No. 1, 107 (1990).
5. K. Mori, J. Fukami, and T. Ohtaki, Agric. Biol. Chem.,35, 1116 (1971); K. Mori, Tetrahedron,28, No. 14, 3747 (1972).