Belen'kaya, R. S.; Zimichev, A. V.; Yukova, O. P.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1989 , vol. 25, # 1 p. 96 - 97
Khimiya Geterotsiklicheskikh Soedinenii, 1989 , # 1 p. 112 - 113

Dastrup, David M.; Yap, Amy H.; Weinreb, Steven M.; Henry, James R.; Lechleiter, Andrew J.
Tetrahedron, 2004 , vol. 60, # 4 p. 901 - 906