Cycloaromatization of Methyl (E)-4-(Methyllithio)-3-(1-pyrrolidinyl)-2-butenoate with α-Oxoketene N,S-Acetals: Direct Synthesis of 3,5-Bis(cycloalkylamino)biphenyls - Reddy, Kethiri R; Ila, Hiriyakkanavar; Junjappa, Hiriyakkanavar (Synthesis, 1995)