1. (a) Review: J.F. Normant, A. Alexakis, Synthesis (1981) 841.
2. (b) V. Ratovelomanana, G. Linstrumelle, Tetrahedron Lett. 22 (1981) 315.
3. (c) V. Ratovelomanana, G. Linstrumelle, Synth. Commun 11 (1981) 917.
4. (d) P.J. Stang, T. Kitamura, J. Am. Chem. Soc. 109 (1987) 7561 and references therein.
5. For more recent examples: (a) M. Alami, P. Ramiandrasoa, G. Cahiez, Synlett (1998) 325. (b) A.L. Braga, G. Zeni, L.H. de Andrade, C.C. Silveira, H.A. Stefani, Synthesis (1998) 39. (c) P. Ramiandrasoa, B. Bréhon, A. Thivet, M. Alami, G. Cahiez, Tetrahedron Lett. 38 (1997) 2447.(d) R. Hara, Y. Liu, W.H. Sun, T. Takahashi, Tetrahedron Lett. 38 (1997) 4103.