Quinoxaline-annelated Z-shaped quadruple-bridged orthocyclophanes: synthesis and crystal structures
摘要:
A three-step synthesis of nineteen Z-shaped quadruple-bridged [6,6] and [6,4]orthocyclophanes comprising two quinoxaline-based sidewalls are described. The synthesis began from the bis-Diels-Alder adducts B1-B3 followed by ruthenium-promoted oxidation of dichloroetheno-bridges in the adducts to generate a bis-alpha-diketones, which were then condensed with various arene-1,2-diamines (9a-g) to construct sidewalls (phane parts) of Z-shaped quadruple-bridged orthocyclophanes D1-3, D2g, and D3g. Single-crystal structures of six orthocyclophanes (D1a, D2a, D2f, D3f, D2g-alpha, and D3g-alpha) were obtained and revealed that the C-Ar-H center dot center dot center dot pi and pi center dot center dot center dot pi stacking interactions between N-containing arene rings are the major driving force for molecular assembly and crystal packing, in addition to the interactions involving the polar OCH3 groups and the solvate molecules. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis and Luminescence Properties of U-Shaped Polycyclic Molecules Containing Syn-Facial Functionalized Quinoxaline Rings
摘要:
[GRAPHICS]Rigid U-shaped molecules containing syn-facially situated quinoxaline rings have been synthesized in three steps, by a combination of the Diels-Alder reaction, the ruthenium-catalyzed oxidation, and the Zn(OAc)(2)-catalyzed condensation of the resulting bis-alpha-diketones with benzene-1,2-diamines. The unsymmetric bis-quinoxalines, with electronically different substituents, and the quinoxaline ring-attached alpha-diketones were also prepared. Their luminescence properties were examined and described.
Synthesis and Luminescence Properties of U-Shaped Polycyclic Molecules Containing Syn-Facial Functionalized Quinoxaline Rings
作者:Teh-Chang Chou、Kung-Ching Liao、Jin-Ju Lin
DOI:10.1021/ol051707z
日期:2005.10.1
[GRAPHICS]Rigid U-shaped molecules containing syn-facially situated quinoxaline rings have been synthesized in three steps, by a combination of the Diels-Alder reaction, the ruthenium-catalyzed oxidation, and the Zn(OAc)(2)-catalyzed condensation of the resulting bis-alpha-diketones with benzene-1,2-diamines. The unsymmetric bis-quinoxalines, with electronically different substituents, and the quinoxaline ring-attached alpha-diketones were also prepared. Their luminescence properties were examined and described.
Quinoxaline-annelated Z-shaped quadruple-bridged orthocyclophanes: synthesis and crystal structures
作者:Teh-Chang Chou、Kung-Ching Liao
DOI:10.1016/j.tet.2010.10.065
日期:2011.1
A three-step synthesis of nineteen Z-shaped quadruple-bridged [6,6] and [6,4]orthocyclophanes comprising two quinoxaline-based sidewalls are described. The synthesis began from the bis-Diels-Alder adducts B1-B3 followed by ruthenium-promoted oxidation of dichloroetheno-bridges in the adducts to generate a bis-alpha-diketones, which were then condensed with various arene-1,2-diamines (9a-g) to construct sidewalls (phane parts) of Z-shaped quadruple-bridged orthocyclophanes D1-3, D2g, and D3g. Single-crystal structures of six orthocyclophanes (D1a, D2a, D2f, D3f, D2g-alpha, and D3g-alpha) were obtained and revealed that the C-Ar-H center dot center dot center dot pi and pi center dot center dot center dot pi stacking interactions between N-containing arene rings are the major driving force for molecular assembly and crystal packing, in addition to the interactions involving the polar OCH3 groups and the solvate molecules. (C) 2010 Elsevier Ltd. All rights reserved.