1. Alekseev, V.I., Kaminskii, V.A., and Tilichenko, M.N., Khim. Geterotsikl. Soedin., 1975, p. 235.
2. Eremeeva, L.M., Moskovkina, T.V., Vasilenko, Yu.V., Saverchenko, A.N., Kaminskii, V.A., and Tilichenko, M.N., Khim. Geterotsikl. Soedin., 1979, p. 240.
3. Perez, S., Lopez, C., Caubet, A., Roig, A., and Molins, E., J. Org. Chem., 2005, vol. 70, p. 4857.
4. Yotphan, S., Bergman, R.G., and Elmann, J.A., Org. Lett., 2009, vol. 11, p. 1511.
5. Van den Eynde, J.J., Godin, J., Mayence, A. Maguestiau, A., and Anders, E., Synthesis, 1993, p. 867.