Pyridinophanes as Two-Centre Phase-Transfer Catalyst for N-Alkylation Reaction
作者:Perumal Rajakumar、Manickam Dhanasekaran
DOI:10.1055/s-2006-926304
日期:——
The syntheticutility of water-soluble pyridinophanes 1 and 2 as an efficient two-centre phase-transfercatalyst for N-alkylation of indoles, imidazole, benzimidazole and benzotriazole has been explored. Application of such pyridinophanes for the synthesis of various precyclophanes involving bis-N alkylation is also described.
Abstract Two types of palladium(II)-based metallacalixarenes [ML]2+ and [ML2]2+ have been synthesized through coordination-drivenself-assembly from a series of flexible pyridine-bridged diimidazole ligands [2,6-bis((1H-imidazol-1-yl)methyl) pyridine (L1), 2,6-bis((1H-benzo[d]imidazol-1-yl)methyl)pyridine (L2), 2,6-bis((1H-naphtho[2, 3-d]imidazol-1-yl)methyl)pyridine (L3)], with palladium(II)-based building
Synthesis and structural characterization of two bis-imidazolium-linked cyclophanes: precursors toward ‘carbeneporphyrinoid’ ligands
作者:Richard S. Simons、Jered C. Garrison、William G. Kofron、Claire A. Tessier、Wiley J. Youngs
DOI:10.1016/s0040-4039(02)00557-9
日期:2002.4
The synthesis and spectroscopic characterization of the imidazolium-linked cyclophanes [1][PF6]2 and [2][PF6]2 are described. Cyclophane [1][PF6]2 contains two imidazolium rings bridged by a 2,6-bis(methyl)-pyridine unit and a 2,5-bis(methyl)-pyrrole unit. Cyclophane [2][PF6]2 contains two imidazolium rings bridged by two 2,5-bis(methyl)-pyrrole units. Cyclophanes [1][PF6]2 and [2][PF6]2 have been