Fukuyama, Takahide; Nishitani, Satoshi; Inouye, Takaya; Morimoto, Keisuke; Ryu, Ilhyong
Organic Letters, 2006 , vol. 8, # 7 p. 1383 - 1386

Fukuda, Hiroshi; Kitazume, Tomoya
Heterocycles, 1997 , vol. 46, # 1 p. 275 - 285