1. For leading reviews, see: (a) Winterfeldt, E. Kontakte (Darmstadt) 1987, 37; Chem. Abstr. 1988, 109, 22316d;
2. (b) Perlmutter, P. Conjugate Addition Reactions in Organic Synthesis; Tetrahedron Organic Chemistry Series Vol, 9; Pergamon: Oxford, 1992;
3. (c) Little, R. D.; Masjedizadeh, M. R.; Wallquist, O.; McLoughlin, J. I. Org. React. 1995, 47, 315.
4. For alkyne, see: (a) Fournet, G.; Balme, G.; Gore, J. Tetrahedron 1991, 47, 6293;
5. (j) Bouyssi, D.; Monteiro, N.; Balme, G. Tetrahedron Lett. 1999, 40, 1297;