1. Wittig reaction from triphenylphosphonium ylide, see: (a) Johnson, A.W. In Ylides and Imines of Phosphorus; Wiley: New York, 1993.
2. (b) Maryanoff, B. E.; Reitz, A. B. Chem. Rev. 1989, 89, 863.
3. (c) Maercker, A., Org. React. 1965, 14, 270.
4. (a) Hon, Y. S.; Lu, L.; Li, S. Y. J. Chem. Soc., Chem. Commun. 1990, 1727.
5. (b) Hon, Y. S.; Chu, K. P.; Hong, P. C.; Lu, L. Synth. Commun. 1992, 22, 429.