Koyama, Junko; Sugita, Teruyo; Suzuta, Yukio; Irie, Hiroshi
Chemical and Pharmaceutical Bulletin, 1983 , vol. 31, # 8 p. 2601 - 2606

Yamada, Toshiro; Goto, Kuniaki; Mitsuda, Yasuhiro; Tsuji, Jiro
Tetrahedron Letters, 1987 , vol. 28, # 39 p. 4557 - 4560