
1. J. Am. Chem. Soc., 105, 3716 (1983)
2. J. Org. Chem., 60, 7724 (1995)
3. Gandhi, R. et al. J. Chem. Soc., Chem. Comm. 1988, 1074
4. Alonso, I. et al. J. Org. Chem. 1993, 58, 3231
5. Wenzel, T. et al. J. Am. Chem. Soc. 1980, 102, 5903
6. Terada, M. et al. Chem. Lett. 1992, 21, 29
7. F&F: Vol. 12, p 559; Vol. 15, p. 355