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Heterocycles, 1987 , vol. 26, # 7 p. 1877 - 1882

Ohta, Shunsaku; Hayakawa, Satoshi; Moriwaki, Hiroki; Harada, Suzumi; Okamoto, Masao
Chemical and Pharmaceutical Bulletin, 1986 , vol. 34, # 12 p. 4916 - 4926

Ohta, Shunsaku; Hayakawa, Satoshi; Okamoto, Masao
Tetrahedron Letters, 1984 , vol. 25, # 49 p. 5681 - 5684