1. For an account, see: (a) Merino, P.; Franco, S.; Merchan, F. L.; Tejero, T. Synlett 2000, 442–454.
2. For reviews, see: (b) Lombardo, M.; Trombini, C. Synthesis 2000, 759–774.
3. (c) Merino, P.; Franco, S.; Merchan, F. L.; Tejero, T. In Recent Research and Development in Synthetic Organic Chemistry; Pandalai, S. G., Ed.; Transworld Research Network: Trivandrum, India, 1998; Vol. 1, pp. 1091–1121.
4. (d) Merino, P.; Tejero, T. Molecules 1999, 4, 165–175.
5. For some leading references, see: (a) Merino, P.; Castillo, E.; Franco, S.; Merchan, F. L.; Tejero, T. J. Org. Chem. 1998, 63, 2371–2374.