1. Z. G. Aliev, L. O. Atovmyan, V. O. Koz'minykh, and Yu. S. Andreichikov, Izv. Russ. Akad. Nauk, Ser. Khim., No. 3, 620 (1992).
2. B. Chantegrel, D. Hartmann, and S. Gelin, Tetrahedron, 33, 45 (1977).
3. S. Gelin, R. Gelin, and D. Hartmann, J. Org. Chem., 43, 2665 (1978).
4. I. E.-S. El-Kholy, M. M. Michrikey, and M. G. Marei, J. Heterocycl. Chem., 19, 1421 (1982).
5. N. M. Igidov, V. O. Koz'minykh, and Yu. S. Andreichikov, in: 3rd Regional Conference of Central Asian Republics and Kazakhstan on the Chemistry of Reactants, Abstracts of Papers, Tashkent (1990), Vol. 1, p. 99.