Tetrahydroquinoline syntheses induced with catalytic amounts of viologen additives
摘要:
The viologen N,N'-dicyanomethyl-4,4'-bipyridinium center dot 2PF(6) was found to induce an aza-Diels-Alder reaction of N-arylimines with N-vinylpyrrolidinone or N-vinylcarbazole, producing tetrahydroquinoline derivatives with high cis/trans selectivities and yields. (C) 2009 Elsevier Ltd. All rights reserved.