1,4-Bis(arylsulfonyl)-1,2,3,4-tetrahydropyridines in Synthesis. Intramolecular Alkylation Reactions and Stereoselective Synthesis of Anti-2,6-Disubstituted Piperidines - Craig, Donald; McCague, Raymond; Potter, Gerard A; Williams, Meredith R V (Synlett, 1998)