title: Efficient catalytic cyclizations of three and two imine assemblies: direct access to tetrahydroimidazo[1,5-c]imidazol-7-ones and imidazoles.
abstract: A cascade cyclization involving union of three imines by an organocatalyst proline is established to afford new fused-tetrahydroimidazo[1,5-c]imidazol-7-ones with excellent regio- and stereoselectivity. Another dehydrogenative cyclization by union of two imines is developed using the Cu(OTf)(2)-Ag(2)O combo catalyst to furnish functionalized imidazoles.
authors.affiliation: Department of Chemistry, University of Calcutta, University College of Science, 92, A. P. C. Road, Kolkata-700009, India.
authors.forename: Yasmin
authors.initials: Y
authors.lastname: Saima
authors.forename: Saikat
authors.initials: S
authors.lastname: Khamarui
authors.forename: Krishnanka S
authors.initials: KS
authors.lastname: Gayen
authors.forename: Palash
authors.initials: P
authors.lastname: Pandit
authors.forename: Dilip K
authors.initials: DK
authors.lastname: Maiti
mesh_terms: D002384:Catalysis; D003500:Cyclization; D007093:Imidazoles / Q000138:chemical synthesis* / Q000737:chemistry; D007097:Imines / Q000737:chemistry*; D008958:Models, Molecular; D011392:Proline / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D007093:Imidazoles; D007097:Imines; D011392:Proline