1. Chem. Eng. News June 11, 1990, p. 25; U.S.A. Patent Nos. 5,122,472 and 5,344,936.
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3. Silks, L. A.; Dunlap, R. B.; Odom, J. D. J. Am. Chem. Soc. 1990, 112, 4979. Also see, Salvatore, B. A.; Smith III., A. B. Tetrahedron Lett. 1994, 35, 1329.
4. Silks, L. A.; Peng, J.; Dunlap, R. B.; Odom, J. D. J. Org. Chem. 1991, 56, 6733.
5. Wu, R., Silks; L. A., Dunlap, R. B.; Odom, J. D. Tetrahedron: Asymmetry 1995, 6, 833.