1. Daniel Little, R., in Comprehensive Organic Synthesis, Trost, B.M., Ed., Pergamon Press, 1991, vol. 5, p. 247
2. Oppolzer, W., Ibid., p. 315.
3. Grashey, R., Leitermann, H., Schmidt, R., and Adelsberger, K., Angew. Chem., 1962, vol. 74, p. 491.
4. Grashey, R., Azomethine Imines in 1,3-Dipolar Cycloaddition Chemistry, Padwa, A., Ed., New York: Wiley, 1984, vol. 1, part 7, p. 733.
5. Schmitz, E., Chem. Ber., 1958, vol. 91, p. 1495.