| Catalytic Ν-sulfonyliminium ion-mediated cyclizations to α-v... 
 [Kinderman, Sape S.; Wekking, Monique M. T.; Van Maarseveen, Jan H.; Schoemaker, Hans E.; Hiemstra, Henk; Rutjes, Floris P. J. T. Journal of Organic Chemistry, 2005 , vol. 70, # 14 p. 5519 - 5527]
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