Tokuyasu, Takahiro; Kunikawa, Shigeki; Abe, Manabu; Masuyama, Araki; Nojima, Masatomo; Kim, Hye-Sook; Begum, Khurshida; Wataya, Yusuke Journal of Organic Chemistry, 2003 , vol. 68, # 19 p. 7361 - 7367