Organic Letters, , vol. 16, # 1 p. 30 - 33

Yasuda, Shigeo; Kumagai, Naoya; Shibasaki, Masakatsu
Heterocycles, 2012 , vol. 86, # 1 p. 745 - 757

Hedden, David; Roundhill, D. Max; Fultz, William C.; Rheingold, Arnold L.
Journal of the American Chemical Society, 1984 , vol. 106, # 17 p. 5014 - 5016