Zhang, Puwen; Liu, Ruiyan; Cook, James M.
Tetrahedron Letters, 1995 , vol. 36, # 50 p. 9133 - 9136

Kost, A. N.; Yurovskaya, M. A.; Vyazgin, A. S.; Afanas'ev, A. Z.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1980 , p. 921 - 925
Khimiya Geterotsiklicheskikh Soedinenii, 1980 , vol. 16, # 9 p. 1222 - 1226

Zhang, Puwen; Liu, Ruiyan; Cook, James M.
Tetrahedron Letters, 1995 , vol. 36, # 50 p. 9133 - 9136