1. Reviews, see: (a) Iwabuchi, Y.; Hatakeyama, S. J. Synth. Org. Chem. Jpn. 2002, 60, 2;
2. (b) Ciganek, E. Org. React. 1997, 51, 201;
3. (c) Drewes, S. E.; Roos, G. H. P. Tetrahedron, 1988, 44, 4653;
4. (d) Basavaiah, D.; Rao, P. D.; Hyma, R. S. Tetrahedron, 1996, 52, 8001. Recently Iwabuchi and Hatakeyama et al. have reported an elegant catalytic asymmetric Baylis–Hillman reaction, see Iwabuchi, Y.; Nakatani, M.; Yokoyama, N.; Hatakeyama, S. J. Am. Chem. Soc. 1999, 121, 10219.
5. Superior amine catalysts for the Baylis–Hillman reaction: the use of DBU and its implications†