Laurenson, James A.B.; Meiries, Sebastien; Percy, Jonathan M.; Roig, Ricard
Tetrahedron Letters, 2009 , vol. 50, # 26 p. 3571 - 3573

Scharf, Hans-Dieter; Frauenrath, Herbert
Chemische Berichte, 1980 , vol. 113, # 4 p. 1472 - 1479