1. C.O. Kappe, Tetrahedron 49 (1993) 6937
2. C.O. Kappe, Eur. J. Med. Chem. 35 (2000) 1043
3. C.O. Kappe, Acc. Chem. Res. 33 (2000) 879 and references therein
4. C.O. Kappe, A. Stadler, Organic Reactions 63 (2004) 1.
5. K.S. Atwal, B.N. Swanson, S.E. Umger, D.M. Floyd, S. Moreland, A. Hedberg, B.C. Reilly, J. Med. Chem. 34 (1991) 806